opaque adj.
1 not clear enough to see through
VERBS be, look | become Add the rice to the pan and cook until it becomes opaque.
ADV. very | completely | almost, nearly | relatively, slightly The glasses looked slightly opaque.
PREP. with The windows were nearly opaque with grime.
2 difficult to understand
VERBS be | become | render sth The complex administrative arrangements render the decision-making process somewhat opaque.
ADV. extremely, very | completely | relatively, slightly, somewhat
You can also check other dicts: opaque (English, 中文解释 ), wordnet sense, Collins Definition