This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. It will help to know 判断 before learning this, but if you don't I won't judge you (the Crabigator will).
People often say that you shouldn't judge a person by their looks.
Judging from what I’ve heard, the best seems to have been saved for last.
It is difficult to judge whether a mushroom is edible or poisonous.