[adjective] of a stern or strict bearing or demeanor; forbidding in aspect; "an austere expression"; "a stern face" Synonyms: austere
[adjective] not to be placated or appeased or moved by entreaty; "grim determination"; "grim necessity"; "Russia's final hour, it seemed, approached with inexorable certainty"; "relentless persecution"; "the stern demands of parenthood" Synonyms: grim, inexorable, relentless, unappeasable, unforgiving, unrelenting
[adjective] severe and unremitting in making demands; "an exacting instructor"; "a stern disciplinarian"; "strict standards" Synonyms: strict, exacting