English
adamantinely
From adamantine + -ly.
A compound of adamantine + -ly
Ancient Greek ἀδάμας ‘diamond’
Ancient Greek ἀδᾰμάντῐνος ‘hard as adamant’
Latin adamantinus
Anglo-Norman adamantin
Middle English adamantine ‘(adjective) of adamant’
English adamantine
Today it means
adv In an adamantine way.
Language periods are conventional ranges, not dates for this word.
Etymograph / adamantinely