bored; depressed; melancholy; sealed; airtight; tightly closed

depressed; sulky; moody; unhappy

sultry; sultriness; hot and stuffy; stifling hot

silent fart

alcohol drunk to drown one's sorrows

muffled thunder; (fig.) sudden shock; blow

(coll.) outwardly cold or retiring but deep and passionate inside

lit. closed gourd; fig. enigma; complete mystery; taciturn person

to keep silent

muffled

to amass wealth while keeping a low profile (idiom)