تنكّر

He, or it, changed, or altered, himself, or itself; or became changed, or altered; (S, A, Msb, TA;) to an unknown state: (S, TA:) [he assumed an unknown appearance: he disguised himself; or became disguised:] he became changed or altered in countenance by anger so that he who saw him did not know him: (Har, p. 144:) or تَنَكُّرٌ signifies the changing, or altering oneself, or itself; or becoming changed, or altered; from a state which pleases one to a state which one dislikes. (T, K.)

إِيَّاكَ وَالتَّنَكُّرَ Avoid thou evil disposition. (Mgh.)

تَنَكَّرَ لِى فُلاَنٌ Such a one [became changed, or altered, in countenance to me by anger so that I did not know him; or] met me in a morose manner (A, TA.) [In article شنف in the K, تَنَكَّرَهُ occurs.]