嗒然

嗒然	tà rán	(literary) despondent; depressed
嗒	dā	(onom.) used in words that describe machine gunfire, the ticking of a clock or the clatter of horse hooves etc
嗒	tà	used in 嗒然 and 嗒丧
然	rán	correct / right / so / thus / like this / -ly