Jamieson, Fausset and Brown on 1 Corinthians 13:5

5. not ... unseemly--is not uncourteous, or inattentive to civility and propriety.

thinketh no evil--imputeth not evil [Alford]; literally, "the evil" which actually is there (Pr 10:12; 1Pe 4:8). Love makes allowances for the falls of others, and is ready to put on them a charitable construction. Love, so far from devising evil against another, excuses "the evil" which another inflicts on her [Estius]; doth not meditate upon evil inflicted by another [Bengel]; and in doubtful cases, takes the more charitable view [Grotius].