grand has 43 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. 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.
extraordinarily good or great; used especially as intensifiers
“a fantastic trip to the Orient”
of high moral or intellectual value; elevated in nature or style
“an exalted ideal”
used of a person's appearance or behavior; befitting an eminent person
“his distinguished bearing”
2 of the 10 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 grand.
Synonyms, antonyms and the broader and narrower relations for grand come from Princeton University’s WordNet. Full sources and licences.
a piano with the strings on a horizontal harp-shaped frame; usually supported by three legs