smiling, someone who often smiles
From Ottoman Turkish متبسم (mütebessim, “one who is smiling, one who smiles often”) from Arabic مُتَبَسِّم (mutabassim, “smiling”), derived from the verbal noun اِبْتِسَام (ibtisām, “smiling”) of the verb اِبْتَسَمَ (ibtasama, “to smile”).
Practice speaking and memorizing "mütebessim" and many other words and sentences in Turkish.