adjective
1.
Synonyms: insatiable , insatiate, quenchless, unquenchable, unsatiate, unsatisfiable
Antonyms: appeasable
2.
Synonyms: grim 3, implacable, ironfisted, merciless, mortal, relentless, ruthless, unflinching, unrelenting, unyielding
Antonyms: appeasable, placable