What is another word for "reticent"?

Roget's Thesaurus (1911) lists these synonyms for "reticent": between, bite, bridle, button, cave, close, concealment, costive, costiveness, counsel, curt, curtness, dumb, escape, few, finger, grave, have, hist, hold, hush, inconversable, jaw, keep, lay, let, make, man, mouth, mum, mute, muteness, not, nothing, obmutescence, one, padlock, pauciloquy, peace, place.