An ~ person is not smiling, and looks serious or unfriendly. (LITERARY)
He was ~ and silent.
...the ~ woman in the ticket booth.
ADJ
UNSMILING
Meaning of UNSMILING in English
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012