Antonyms of adj speech-endowed

1 sense of speech-endowed

Sense 1
speech-endowed -- (capable of speech; "the speaking animal")

INDIRECT (VIA articulate) -> inarticulate, unarticulate -- (without or deprived of the use of speech or words; "inarticulate beasts"; "remained stupidly inarticulate and saying something noncommittal"; "inarticulate with rage"; "an inarticulate cry")

Similarity of adj speech-endowed

1 sense of speech-endowed

Sense 1
speech-endowed -- (capable of speech; "the speaking animal")
       => articulate (vs. inarticulate) -- (expressing yourself easily or characterized by clear expressive language; "articulate speech"; "an articulate orator"; "articulate beings")