Earlier, we discussed the best synastry aspects you can find in a astrology compatibility chart.
But what about the ‘bad’ ones? Which synastry aspects are considered detrimental to a relationship? Let’s discuss.
The worst synastry aspects
Sun square Mars, Sun opposite Mars
This aspect is tough to handle , especially those who do not like too much conflict or drama in their relationships. The Sun and Mars are both confrontational and driven planets. so a square aspects between them in synastry can lead to much frustration and ego clashes.
In this couple, competitiveness is taken to a new level. These two may see each other more as enemies rather than partners, and tend to irritate each other easily. At some point, the irritation and conflict may become too much, resulting in a huge blowout.
Moon square Mars, Moon opposite Mars
Hard aspects between one person’s Mars and another person’s Moon indicates petty arguments and hurt feelings. In this relationship, the couple know how to get under each other’s skin.
The Moon person may find the Mars person overly aggressive, rude, and hurtful, while the Mars person thinks the Moon person is overly sensitive and emotional. Indeed, the Moon person is very sensitive to any perceived meanness or aggression from the Mars person, and vice versa. There is a tendency to taking things “the wrong way” in this relationship. It is hard to discuss feelings without hurting each other.
Mars square Mars, Mars opposite Mars
This is another tough aspect. Mars is the planet of energy and action, so when it is in square aspect to another person’s Mars, frustrations and conflicts may feature strongly in the relationship. This couple is very competitive with each other, but not in a healthy way. These two easily irritate and annoy one another, which can make it hard to stay together in the long run.
This aspect also does not bode very well in the bedroom. It shows different likes and dislikes, and dissimilar rhythms and energies.
Sun square Saturn, Sun opposite Saturn
This aspect can be tough in a relationship. The Sun person feels stifled and restricted by the Saturn person, while the Saturn person may feel the Sun person is immature and impractical.
The Sun person may eventually feel they are treated like a child by the Saturn person. For the Saturn person, it can be hard not to criticize the Sun person, for they see the Sun person as childish and irresponsible. This relationship can have a negative effect on the Sun person’s self-esteem in the long run.

Moon square Saturn, Moon opposite Saturn
The square between one person’s Moon and another person’s Saturn indicates emotional distancing and censoring. In this relationship, the Moon person does not feel safe and free to express their emotional needs. Instead, they feel afraid to express themselves to the Saturn person, out of fear the Saturn person will reject or disapprove of the Moon’s feelings.
The Saturn person feels the Moon person is overly sensitive and needy, while the Moon person finds the Saturn person cold and impersonal. In this relationship, the Saturn person probably feels awkward about emotional communication, so they discourage the Moon person from expressing themselves.
Venus square Saturn, Venus opposite Saturn
This is a classic indicator of relationship difficulties. In this relationship, the couple feels awkward expressing their love and affection to each other. This is because the Saturn person tends to discourage the Venus person from doing so. It can be very difficult to understand what each person feels in this relationship.
This aspect also indicates there could be barriers standing in the way of this couple formalizing a partnership. Sometimes differences in cultures, religions, social classes are indicated by this aspect.
Mars square Saturn, Mars opposite Saturn
This aspect is a tough one, and indicates much frustration and conflict in the relationship. The Mars person feels stifled and restricted by the Saturn person, and feel that nothing they do is ‘good enough’ for the Saturn person. Saturn wants to repress the Mars person’s energy and drive, for they find the Mars person very childish, impatient and impulsive.
The Saturn person may frequently get annoyed with the Mars person, while the Mars person finds the Saturn person to be a wet blanket. The Mars person feels they cannot express their assertive side without upsetting Saturn. This aspect can be a recipe for disaster, with both partners feeling frustrated with the other.
Sun square Uranus, Sun opposite Uranus
Uranus is the planet of freedom and liberation, so when it is square another person’s Sun, it can cause relationship issues. This relationship may have begun very suddenly and unexpectedly.
The Uranus person is generally unreliable and unpredictable when it comes to fulfilling their obligations to the Sun person. In turn, the Sun person might not feel they can rely on the Uranus person in times of need. Something always seems to get in the way of their relationship, and the plans they make together often do not pan out. This relationship has a strong on-off quality, and it can be difficult for these two to settle into a committed partnership.
Venus square Neptune, Venus opposite Neptune
If you have this aspect natally, everyone around your age has their Neptune in square aspect to your Venus.
This aspect can be problematic because of the confusion and deception Neptune tends to bring to a relationship. The Venus person feels the Neptune person is their soulmate, and vice-versa, but there can be difficultly when it comes to committing to each other fully.
When issues arise in this relationship, this couple is likely to ignore conflict and sweet their troubles under the rug. Other may think the couple is not in touch with reality because of their refusal to see the relationship for what it is.
The Venus person (or the Neptune person) projects their ideals on their partner. There may be a tendency to overpromise and underdeliver in this relationship. They see their partner as someone other than who they really are, which can cause issues later one when the rose-colored glasses are removed.
Mars square Pluto, Mars opposite Pluto
At first, this relationship can be quite enthralling and exciting. The sensual connection between you is off the charts! Over time, however, issues related to power, control, and anger may surface in the relationship.
Mars is the planet of energy and assertiveness. Mars shows our drive and ambition, and how we project our energies. Pluto, on the other hand, is the planet of transformation and power. In this relationship, when the Mars person asserts their will in the relationship, the Pluto person pushes back even harder. Pluto may resort to manipulative games in order to keep the Mars person ‘in line’, which angers the Mars person even more.
In this relationship, strong feelings are evoked on both sides. Each partner really knows how to push each other’s buttons and get under each other’s skin. At worst, this aspect can indicate physical conflict and violence.
What are your least favourite synastry aspects, and why? Comment below!