فه doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 2 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• فَهِهَ Form 1

  1 فَهِهَ ذ , (K,) [or perhaps فَهَّ, but originally فَهِهَ], like فَرِحَ, (K,) sec. pers. فَهِهْتَ, [aor. فَهَهَ ,] inf. n. فَهَهٌ (S, TA) [and app. فَهَّةٌ and فَهَاهَةٌ], He (a man, S) lacked power or ability. (S, K.) …

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• فَهٌّ

  فَهٌّ ذ , (S, K,) applied to a man. (S.) Lacking power or ability; (S, K;) as also , (CK, but omitted in other copies of the K,) and , (S, * K,) and , (K,) which last is mentioned by IDrd as signifying dull of tongue, la…

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