“+ adjective
Etymology: un- (I) + express + -ive
1. obsolete : incapable of being expressed in words : transcending expression or description : ineffable , inexpressible
the fair, the chaste, and unexpressive she — Shakespeare
2. : not expressive : lacking expression : failing to convey the meaning or feeling intended
an unexpressive face
unexpressive voices chanting the correct service — L.P.Smith