na-adjective
seemingly good; looking good; of good appearance
Colloquial expression formed from 良さ (goodness) + げ (seeming). Used in casual speech to describe something that appears good, nice, or promising. Similar to 良さそう but more informal.
この店、よさげな雰囲気だね。
This shop has a nice atmosphere, doesn't it?
あの人、よさげな人だと思ったけど、ちょっと違った。
I thought that person seemed nice, but it turned out differently.
Derived from the stem of the adjective 良い/いい (good) → 良さ (goodness) + the suffix げ (seeming). The resulting form よさげ is a colloquial contraction of 良さそう (seems good).