What does lightproof mean?
Lightproof means Sealed so that no light can enter..
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Pronunciation varies by accent · adjective
Sealed so that no light can enter..
Unexposed photographic film must be kept in a lightproof container or it will be exposed and ruined.
Use lightproof when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Lightproof means Sealed so that no light can enter..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Unexposed photographic film must be kept in a lightproof container or it will be exposed and ruined.
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