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afterthought has 3 distinct synonyms spread across 1 of its 2 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. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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.
thinking again about a choice previously made
“he had second thoughts about his purchase”
an addition that was not included in the original plan
“the garage was an afterthought”
Synonyms, antonyms and the broader and narrower relations for afterthought come from Princeton University’s WordNet. Full sources and licences.