UNEXPRESSIVE

Un′ex‐press″ive (?), a. 1. 1. Not expressive; not having the power of utterance; inexpressive.
2. 2. Incapable of being expressed; inexpressible; unutterable; ineffable.
Run, run, Orlando; carve on every tree The fair, the chaste and unexpressive she. Shak. — Un′ex‐press″ive‐ly, adv.