Meaning of 半可 in Japanese

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Definition of 半可

はんか(hanka) 【半可】

はんかつう(hankatsuu) 【半可通】

なまはんか(namahanka) 【生半可】

(adj-na, n) superficial; half-hearted
仕事を生半可に知っている人が書くことは、できれば避けたい。
I'd rather not have those written by people who only know their work imperfectly.