adj. 1 large and heavy or solid. 2 (of the features, head, etc.) relatively large; of solid build. 3 exceptionally large (took a massive overdose). 4 substantial, impressive (a massive reputation). 5 Mineral. not visibly crystalline. 6 Geol. without structural divisions. massively adv. massiveness n.
[ ME f. F massif -ive f. OF massiz ult. f. L massa MASS(1) ]