hardest
hard-est
adverb
To the greatest extent or with the most effort, intensity, or difficulty.
"She worked hardest to achieve her dream."
adjective
The superlative form of 'hard', meaning most difficult, firm, or severe.
"That was the hardest decision of my life."
Thesaurus
Synonyms: hard-boiled, steely, scheming, calculating, hardened, calculative, conniving, hard, shrewd, case-hardened, intemperate, indulgent
Antonyms: diffuse, diffused, easy, lightly, soft, sonant, voiced