Antonym: expressive. Similar words: expression, expressive, expressible, inexpressible, suppression, oppression, repression, depression. Meaning: [-lɪs] 
adj. deliberately impassive in manner.
adj. deliberately impassive in manner. 
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31. His voice was utterly and drearily expressionless.
32. The Monsignor gave him a slow, expressionless nod.
33. The appearance of patients at this phase has been described as showing “ghost-like” drawn features, deep-set eyes, expressionless faces, and extreme lethargy.
34. The eyes, slow of movement and heavy - lidded, were almost expressionless under the shaggy, in drawn Brown.
35. Birkin was expressionless , neutralized, possessed by her as if it were his fate, without question.
36. The babies' faces are expressionless and their pupils aren't visible which gives the appearance of lifelessness and dreadfulness.
37. In addition, he also frequently encountered a number of expressionless, enigmatic visages.
38. A lonely porcupine likes to wander to the river alone and stare into the water expressionless.
More similar words: expression, expressive, expressible, inexpressible, suppression, oppression, repression, depression, compression, impression, express, motionless, emotionless, expressly, expressed, great depression, impressionistic, compressional wave, precession, regression, aggression, digression, progression, congressional, transgression, pressing, session, cession, oppressive, impressive.