awkward has 12 distinct synonyms spread across 4 of its 6 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is graceful.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
lacking grace or skill in manner or movement or performance
“an awkward dancer”
difficult to handle or manage especially because of shape
“an awkward bundle to carry”
not elegant or graceful in expression
“an awkward prose style”
hard to deal with; especially causing pain or embarrassment
“awkward (or embarrassing or difficult) moments in the discussion”
socially uncomfortable; unsure and constrained in manner
“awkward and reserved at parties”
1 of the 6 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for awkward.
Synonyms, antonyms and the broader and narrower relations for awkward come from Princeton University’s WordNet. Full sources and licences.