also: いづれ
pronoun
Interrogative pronoun used to ask about a choice among options. Often used in formal or written contexts; in casual speech, どれ or どちら is more common.
いずれの方法が最適でしょうか。
Which method would be the most suitable?
いずれの国から来ましたか。
Which country are you from?
pronoun
Used in the patterns いずれも or いずれの...も to mean 'all' or 'both' of the options. Slightly formal.
いずれの案も一長一短がある。
Both proposals have their pros and cons.
応募者はいずれも優秀だった。
All the applicants were excellent.
adverb
anyway; in any case; at any rate
Adverbial use meaning 'in any case' or 'anyway'. Often used to shift the topic or to emphasize that something is true regardless of circumstances.
いずれにしても、今日中に決めなければならない。
In any case, we have to decide by the end of today.
いずれまたお会いしましょう。
Anyway, let's meet again sometime.
adverb
sooner or later; eventually; someday
Adverbial use meaning 'sooner or later' or 'eventually'. Implies that something will happen in the future, though the exact time is uncertain.
いずれ雨はやむだろう。
The rain will stop sooner or later.
いずれ真実が明らかになる。
The truth will come out eventually.