The word "in-expressive" refers to something that lacks the ability to express emotions or ideas. Antonyms for this word include "expressive," "demonstrative," and "communicative." Expressive implies that something has the ability to convey emotions or ideas through movement, speech, or other means. Demonstrative is similar, but it specifically refers to exhibiting emotions openly through behavior or action. Communicative suggests that something is able to transmit information or feelings through words or gestures. Other possible antonyms for in-expressive include animated, vivacious, and effusive, all of which suggest a lively or enthusiastic expression of emotion or ideas.