well-advised has 1 distinct synonym spread across 1 of its 1 sense. 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 ill-advised.
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 the benefit of careful prior consideration or counsel
“a well-advised delay in carrying out the plan”
Synonyms, antonyms and the broader and narrower relations for well-advised come from Princeton University’s WordNet. Full sources and licences.