a. 1. Destitute or deprived of the faculty of speech. [ 1913 Webster ]
2. Not speaking for a time; dumb; mute; silent. [ 1913 Webster ]
Speechless with wonder, and half dead with fear. Addison. [ 1913 Webster ]
-- Speech"less*ly, adv. -- Speech"less*ness, n. [ 1913 Webster ]