لين doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 3 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• لَانَ Form 1

  1 لَانَ ذ , inf. n. لِينٌ [not لَيْنٌ as in the CK] and لَياَنٌ, (T, S, M, K,) contr. of خَشُنَ; (S, K in art. خشن, and TK;) It was, or became, soft, as opposed to rough or harsh; smooth; plain; without asperities; fine …

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• لِينُ

  لِينُ العَيْشِ ذ Softness, delicateness, or easiness, of life.…

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• لَيِّنٌ

  عَيْشٌ لَيِّنٌ ذ Soft, delicate, or easy, life. -b2- لَيِّنُ الجَانِبِ: see جَانِبٌ. -b3- لَيِّنُ الأَعْطَافِ; &c.: see art. عطف.…

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