Excerpt from my latest Sasstrology article (please leave comments on the Sasstrology site):
"No aspect is more frustrating than the inconjunct (or quincunx). This tense 150-degree angle links two signs that have absolutely nothing in common. Each sign is in a different element (fire, earth, water, air), a different modality (cardinal, fixed, mutable), and a different polarity (positive and negative). And yet, when two planets (five signs apart) fall within orb of the inconjunct, they connect even though they have zero understanding of each other. The result is a struggle between unrelated energies that have no way of finding a middle ground. This is difficult enough to handle by transit or in the natal chart, but imagine if you have to deal with this aspect in synastry."