This is the 2305th most frequent Japanese word.
あいにく
Unfortunately; regrettably.
The word 'あいにく' (ainiku) is used here to express regret about a situation that does not align with desires or expectations.
あいにく、彼は外出中です。
Unfortunately, he is out right now.
In this sentence, 'あいにく' is used to describe unfavorable circumstances, showcasing the speaker's disappointment or acknowledgment of bad luck.
あいにくな天気で、イベントが中止になりました。
Due to the unfortunate weather, the event was canceled.
'あいにく' expresses regret or apologetic sentiment when informing a situation that's unfortunate for the listener.