Synonyms of 'gibbous'
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Convex is used to describe something that curves outwards in the middle.
The lens is flat on one side and convex on the other.
If someone is humped, their back is bent so that their shoulders are further forward than usual and their head hangs down.
She watched his humped back disappear down a dim corridor.
Thesaurus for gibbous from the Collins English Thesaurus
(of the moon or a planet ) more than half but less than fully illuminated