Refers to an avoidable mistake, oversight, or lapse in judgment, often with a sense of regret. Common in the phrase 不覚を取る (to suffer a defeat or make a blunder).
Rare, literary use for loss of consciousness or being unaware. More commonly expressed as 意識不明 or 気絶 in modern Japanese.
It was a blunder to make that kind of mistake.
Letting my guard down during the match was a blunder.
He fell unconscious from that single blow.
shallow thinker; indecisive person
tears shed in spite of oneself; involuntary tears
unconscious; blacked out; having no memory of one's actions
pitcher's misjudgment; mistake pitch
Standard kanji spelling.
From Middle Chinese 不覚 (bjuw kæwk, literally 'not awake/aware'). The kanji 不 (not) and 覚 (awake, perceive) combine to mean 'unawareness' or 'failure to realize', which extended to 'blunder' in Japanese.