1. unable to speak distinctly or express oneself clearly: "he was inarticulate with abashment and regret"Similartongue-tiedlost for wordsat a loss for wordsunable to express oneselfunable to get a word outpoorly spokenmutedumbspeechlessrare:mumchanceOppositearticulatesilver-tongued
▪ denoting a brachiopod in which the valves of the shell have no hinge and are held together by muscles.
Word Originearly 17th century: from in-1 ‘not’ + the adjective articulate; the sense ‘not clearly pronounced’ corresponds to that of late Latin inarticulatus.