Massive comes from Latin massa meaning 'kneaded dough' — a word for bread dough that grew to describe mountains. The same root gives us mass, massacre, and marzipan.
Exceptionally large, heavy, or solid in size or extent.
From Middle French massif meaning 'bulky, solid', from Old French masse meaning 'lump, heap', from Latin massa meaning 'kneaded dough, lump', from Greek maza meaning 'barley cake, lump of dough'. The progression is striking: a word now used for mountains and skyscrapers began as a lump of bread dough. The Greek maza comes from the verb massein 'to knead', from Proto-Indo-European *maḱ- meaning 'to knead, to press'. The same root gave English mass