severe

Synonyms: astringent austere biting caustic close cold cruel cutting disapproving dour earnest firm flinty forbidding grave grim hard hardnosed harsh inconsiderate inexorable inflexible iron-handed obdurate oppressive peremptory pitiless relentless resolute resolved rigid satirical scathing serious sober stern stiff strait-laced strict tight-lipped unalterable unbending unchanging unfeeling unrelenting unsmiling unsparing

Antonyms: amenable compromising easy-going friendly willing

Synonyms: acute arduous ascetic austere bitter bleak consequential critical dangerous dear demanding despotic distressing domineering drastic effortful exacting extreme fierce forbidding grave grim grinding hard heavy hefty implacable inclement intemperate intense mordant oppressive overbearing pitiless punishing rigorous rugged serious sharp sore strenuous stringent taxing toilsome tough tyrannical unpleasant unrelenting violent weighty wicked

Antonyms: calm easy facile mild temperate