A quincunx links two planets 150° apart, in signs that share no element and no modality in common — the two planets simply don't speak the same language, which is what makes this aspect read as persistently awkward rather than cleanly easy or cleanly hard.
It rarely resolves into either harmony or open conflict; instead it asks for constant small adjustment, a habit of accommodating something that never quite becomes second nature no matter how long it's worked with.