زميت 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.

• زَمِيتٌ

  زَمِيتٌ ذ Grave, staid, steady, sedate, or calm, (IAar, S, A, K, TA,) in his sitting-place: (IAar, TA:) pl. رُمَتَآءُ, (A,) or زمت [app. زُمْتٌ or زُمُتٌ, if not a mistranscription for زُمَتَآءُ, which I rather think i…

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• زِمِّيتٌ

  زِمِّيتٌ ذ Very grave, staid, steady, sedate, or calm: (S, K, TA:) forbearing, or clement; quiet; of few words; like صِمِّيتٌ: or, as some say, silent. (TA.)…

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