Keeping one's thoughts and opinions to oneself; reserved or restrained.
Hesitant or not wanting to take some action; reluctant (usually followed by a verb in the infinitive).
Without a vote; having no input into a decision.
Spoken without vibration of the vocal cords; unvoiced, surd, breathed. Examples: [t], [s], [f], [m̥], [u̥].
Lacking a voice, without vocal sound.