oppressive

Synonyms: backbreaking bleak brutal burdensome confining cruel demanding depressing depressive despotic dictatorial discouraging disheartening dismal dispiriting exacting exigent gloomy grievous grinding harsh headache heavy heavy-handed hefty inhuman ironhanded mean onerous overbearing rough going severe somber superincumbent taxing tough troublesome tyrannical unjust weighty

Antonyms: calm gentle relieving

Synonyms: airless close heavy muggy overpowering steam bath steamy sticky stifling stuffy suffocating sultry sweat box torrid

Antonyms: cool mild temperate