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dull has 27 distinct synonyms spread across 10 of its 19 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 4 recorded opposites are lively, bright, sharp, sharpen.
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 in liveliness or animation
“he was so dull at parties”
emitting or reflecting very little light
“a dull glow”
not having a sharp edge or point
“the knife was too dull to be of any use”
not clear and resonant; sounding as if striking with or against something relatively soft
“the dull thud”
make dull in appearance
“Age had dulled the surface”
become dull or lusterless in appearance; lose shine or brightness
“the varnished table top dulled with time”
deaden (a sound or noise), especially by wrapping
2 of the 19 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for dull.
Synonyms, antonyms and the broader and narrower relations for dull come from Princeton University’s WordNet. Full sources and licences.