adjective

offering no means of relaxation and pleasure.

a comfortless prison

gloomy,dreary,dull,dismal,bleak,drab,grim,sombre,dark,dim,dingy,funereal,miserable,wretched,joyless,cheerless,unhappy,depressing,disheartening,dispiriting,unwelcoming,uninviting,inhospitable,austere,severe,stark,bare,spartan,desolate,clinical,institutional,impersonal