1. inexpressive - Adjective
2. inexpressive - Adjective Satellite
Inexpressible.
Without expression or meaning; not expressive; dull; unintelligent; as, an inexpressive countenance.
Source: Webster's dictionaryIn a statesman's transactions there are many things which cannot be communicated otherwise than by manner without inconvenient commitment or controversy; and that will be the most serviceable manner which can be expressive or inexpressive at pleasure, and be used as a dark lantern to his meanings. Henry Taylor
an inexpressive face Source: Internet