"Wearying" comes from the verb "weary". That verb works two ways: to become very tired ("the old horse wearied"), and to make someone very tired ("the long climb wearied us"). The -ing form you are looking at is normally used as an adjective, describing the thing that does the tiring: a wearying day, a wearying argument, a wearying wait. The tiredness here is heavy and slow. It is not the good tiredness after exercise; it is the kind that reaches your spirit as well as your legs — you feel flat, and you have run out of willingness to keep going. That is because "weary" itself is a deeper word than "tired". Say "I am tired" and you need a nap. Say "I am weary" and something has been going on for far too long. The word is formal and quite literary. In ordinary Taiwanese-English conversation you would say "exhausting" or "draining", and both are safer choices. "Wearying" turns up in news writing, novels, and speeches: "a wearying round of meetings", "the wearying business of finding somewhere to live". It sits very close to "wearing" and "wearisome", and honestly the three overlap so much that even careful writers swap them. If you want a rough map: "wearying" points at tiredness, "wearing" at slow draining plus mild irritation, "wearisome" at boredom plus length. Also useful: the verb appears in the fixed phrase "never weary of" — "she never wearies of telling that story" — meaning she never gets tired of it.

令人疲憊的、耗神的（累到心裡去的那種，不只是身體累；正式、偏書面，日常會說 exhausting 或 draining）