i-adjective
young; fresh; inexperienced; tender
Kantō dialect adjective describing something as young, fresh, or inexperienced, often applied to people, plants, or food.
この大根はまだみるいから、もう少し置いたほうがいいよ。
This daikon is still young and tender, so you'd better leave it a bit longer.
あの新人はまだみるいけど、やる気はあるね。
That newbie is still inexperienced, but he's motivated.