The word "unarticulate" refers to a person who is unable to express themselves clearly or efficiently. Some synonyms for unarticulate are inarticulate, tongue-tied, incoherent, hesitant, mumbling, and garbled. Inarticulate means a lack of ability to communicate effectively, often resulting in stuttering, stammering, or stumbling over words. Tongue-tied refers to a feeling of being unable to speak due to nervousness or anxiety. Incoherent suggests a person is unclear, and their thoughts are disjointed or unintelligible. Hesitant means uncertainty in speech, a reluctance to articulate thoughts and feelings. Finally, mumbling and garbled both imply unclear speech, where words are muffled or mispronounced.