The Collaborative International Dictionary
Inexpressive \In`ex*press"ive\, a.
Inexpressible. [R.]
Without expression or meaning; not expressive; dull; unintelligent; as, an inexpressive countenance.
Wiktionary
a. Lacking expression or emotion.
WordNet
adj. not expressive; "an inexpressive face"
Usage examples of "inexpressive".
The priest, speaking in a conventional voice that was strangely inexpressive of his inward emotion, asked Androvsky and Domini whether they would take each other for wife and husband, and listened to their replies.
Reginald Charlton, on the other hand, was of the modern school and used as little make-up as possible, because he said it made the face into a mask, and inexpressive.
The heads of old men were to be seen, inexpressive and peaceful, with their hair and complexions looking like silver medals tarnished by steam of lead.