complete has 27 distinct synonyms spread across 8 of its 10 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 incomplete.
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.
having every necessary or normal part or component or step
“a complete meal”
perfect and complete in every respect; having all necessary qualities
“a complete gentleman”
without qualification; used informally as (often pejorative) intensifiers
“an arrant fool”
having come or been brought to a conclusion
“the harvesting was complete”
Synonyms, antonyms and the broader and narrower relations for complete come from Princeton University’s WordNet. Full sources and licences.