the GNU version of the Collaborative International Dictionary of English
adj. Having no distinct or distinctive features.
The Century Dictionary and Cyclopedia
Having no distinct features; shapeless.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. lacking distinguishing characteristics or features
Word Usage
"It was a figure in a white robe, with a kind of featureless mask over the face, through the apertures of which the eyes threw an unintelligible light."