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

• Lexulous
• Wordscraper
• Wordosaur

adj. Lacking the faculty of speech.

adj. Temporarily unable to speak, as through astonishment.

adj. Refraining from speech; silent.

adj. Unexpressed or inexpressible in words: speechless admiration.

adj. not speaking; not knowing what to say; silent, especially due to surprise, amazement, etc.

adj. Destitute or deprived of the faculty of speech.

adj. Not speaking for a time; dumb; mute; silent.

Not having or not using the faculty of speech; unable to speak; dumb; mute.

Refraining or restrained from speech; not speaking, either of purpose or from present inability: as, to stand speechless before one′ s accusers; speechless from terror.

Characterized by the absence of speech; unexpressed; unattended by spoken words.

Using few words; concise.

adj. temporarily incapable of speaking

"The stone walls and wooden elements of the house are impressive design elements, but what can really leave one speechless is the natural environment."

inarticulate    unarticulate   

dumb    mute    silent   

mute    breathless    daze    wide-eyed    unable    helpless    motionless    unutterable    petrify    incredulous