Prompt, Clever, Shrewd, Smart
Noun and な adjective
きびん
ウェイトレスってのは機敏に動くものなのに、彼女はとんでもなく鈍いんだよ。
Waitresses are supposed to move quickly, but she is ridiculously slow.
A machine alert is an alert that is timed by a machine, not by a human. That is pretty quick and clever. Machines can move and think so much faster than us, after all.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.