The opposite of aggressive is passive. Both are bad. What you want to be is assertive, which is the middle road where you look out for your own interests while still respecting others.
There're a bunch of other situations where both extremes are bad. The opposite of indifferent is obsessed, and both are negative qualities in a relationship - you want to be involved. The opposite of flat is sharp, and both are bad - you want to be in tune. The opposite of hypo-anything is hyper-anything, and both are bad - you want to be healthy.
There're a bunch of other situations where both extremes are bad. The opposite of indifferent is obsessed, and both are negative qualities in a relationship - you want to be involved. The opposite of flat is sharp, and both are bad - you want to be in tune. The opposite of hypo-anything is hyper-anything, and both are bad - you want to be healthy.