ignore has 9 distinct synonyms spread across 3 of its 5 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 2 recorded opposites are notice, know.
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.
bar from attention or consideration
“She dismissed his advances”
be ignorant of or in the dark about
Synonyms, antonyms and the broader and narrower relations for ignore come from Princeton University’s WordNet. Full sources and licences.