Compound adjective; can be used both literally (lacking facial hair/irregularities) and figuratively (smug, brazenly assured).
Translations
The boy was smooth-faced and could not yet grow a beard.
Мальчик был гладколицым и ещё не мог отрастить бороду.
безбородыйУпотребляется, когда подчёркивается отсутствие растительности на лице наглыйФигуральное значение: самоуверенный, бесстыдный Definitions
Having a face that is smooth, free of hair, wrinkles, or blemishes. The boy was smooth-faced and could not yet grow a beard.
Figuratively, displaying brazen or smug assurance; shamelessly confident. The smooth-faced politician promised reforms he never intended to deliver.