i Register
In some senses, opaque is marked as figuratively, obsolete, poetic. Watch for register when choosing this word.
VERBS
be, look
become
The glass door became opaque when we applied the frosted film to it.
ADV
very | completely | almost, nearly
relatively, slightly
The bathroom window was relatively opaque, so nobody could see inside from the street.
PREP
with
The bathroom mirror became opaque with steam after the hot shower.
VERBS
be | become
render sth
The heavy curtains render the living room completely opaque during the day.
ADV
extremely, very | completely | relatively, slightly, somewhat