اغتم 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.

• اغتم Form 4

  4 اغتم الزِّيَارَةَ ذ , (K, TA, in the CK [erroneously] اغْتَتَمَ,) He visited much, so as to weary. (K, TA.) One says, لَا تُغْتِمِ الزِّيَارَةَ فَتُمِلَّ [Do not thou visit much, so as to weary]. (TA.) -b2- And they sa…

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• اغتمّ Form 8

  8 اغتمّ ذ He was, or became, grieved, or caused to mourn or lament, or to be sorrowful or sad or unhappy; (S, * K;) as also : (K:) both mentioned by Sb. (TA.) -b2- And, said of a plant, or herbage, It was, or became, tal…

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