1. Destitute of expression.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• exspressionless,
• expresionless,
• expressionlessly,
• wxpressionless,
• sxpressionless,
• dxpressionless,
• rxpressionless,
• 4xpressionless,
• 3xpressionless,
• ezpressionless,
• ecpressionless,
• edpressionless,
• espressionless,
• exoressionless,
• expresssionless,
• exprressionless,
• expressonless,
• expressionles,
• impresionless,
• expressionlessy

• expressively,
• expressionist,
• ex-president,
• express mail,
• expressionistic,
• express mirth,
• express-mail,
• express joy,
• Express train,
• express trust,
• expressive style,
• express bus,
• expressionlessly,
• express feelings,
• expressionism,
• expressiveness,
• expressible.

The adjective form of "expressionless" is "expressionless".

The plural form of the word "expressionless" is "expressionless." It remains the same in both singular and plural forms.

The singular form of the word "expressionless" is "expressionless" as well. This word is the same in both singular and plural forms.