闷

stuffy / shut indoors / to smother / to cover tightly

bored / depressed / melancholy / sealed / airtight / tightly closed

heart / mind / intention / center / core / CL:顆|颗[ke1],個|个[ge4]

gate / door / CL:扇[shan4] / gateway / doorway / CL:個|个[ge4] / opening / valve / switch / way to do something / knack / family / house / (religious) sect / school (of thought) / class / category / phylum or division (taxonomy) / classifier for large guns / classifier for lessons, subjects, branches of technology / (suffix) -gate (i.e. scandal; derived from Watergate)

oppressive (of weather) / heavy / depressed / not happy / (of sound) dull / muffled

puzzled / bewildered

depressed / dejected / feeling low

to relieve boredom or melancholy / a diversion

to seethe / to sulk / to be pissed off (vulgar)

moody; gloomy

moody / gloomy

to feel oppressed / to be depressed / to feel dejected

depressed / gloomy

lit. to eliminate worry and dispel melancholy (idiom); diversion from boredom / to dispel depression or melancholy / to relieve stress / a relaxing pass-time

fainting and giddy / one's head spins

to divert oneself from melancholy

(coll.) to wonder secretly / to make wild conjectures

erhua variant of 納悶|纳闷[na4 men4]

to use it for the purpose of relieving the tedium to some extent

chest pain / chest distress

depressed / full of worries / feeling down

to divert one's mind from boredom (idiom)

to divert oneself from melancholy

to faint / to swoon / to lose consciousness