i-adjective
Hokkaido dialect word meaning foolish or stupid; used in casual, often self-deprecating or teasing contexts.
そんなはんかくさいこと言うなよ。
Don't say such a stupid thing.
はんかくさい失敗をしてしまった。
I made a foolish mistake.
Kansai dialect for 'fool'; はんかくさい is specific to Hokkaido and used as an adjective rather than a noun.
Hokkaido dialect; the exact derivation is uncertain, but it may be related to 半可 (half-baked) and 臭い (smelling of), suggesting something that seems half-done or foolish.