This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Lacking expression; blank: an inexpressive stare.

adj. Devoid of emotion or style; flat or dull: an inexpressive violin performance.

adj. Lacking expression or emotion.

adj. Inexpressible.

adj. Without expression or meaning; not expressive; dull; unintelligent.

Not expressive; wanting expression; not distinctly significant or representative: as, an inexpressive gesture or portrait.

Not to be expressed; inexpressible; ineffable.

adj. not expressive

"In some of these paroxysms of fancy, Miss Walton did not fail to be introduced; and the picture which had been drawn amidst the surrounding objects of unnoticed levity was now singled out to be viewed through the medium of romantic imagination: it was improved of course, and esteem was a word inexpressive of the feelings which it excited."

incommunicative    uncommunicative   

inexpressible    dull    unintelligent    blank   

unanalysed    uncomprehending    dirge-like    minor-key    unresponsive