Cautious in speaking; uncommunicative; also; secretive. close-mouthed

1. Lacking the human power of speech
2. of a person , often offensive; lacking the ability to speak
3. Temporarily unable to speak (as from shock or astonishment)
4. Not expressed in uttered words
5. Silent; also; Taciturn
6. Lacking some usual attribute or accompaniment; especially; having no means of self-propulsion
7. Lacking intelligence; stupid
8. Showing a lack of intelligence
9. Requiring no intelligence
10. Not having the capability to process data — compare intelligent

ETYM Of imitative origin. Related to Mumble.
Failing to speak or communicate etc when expected to; SYN. silent.

ETYM Latin mutus; cf. Greek myein to shut, Skr. muta bound, muka dumb: cf. Old Eng. muet, from French muet, a dim. of Old Fren. mu, Latin mutus.
1. Expressed without speech; especially because words would be inappropriate or inadequate; SYN. tongueless, unspoken, wordless.
2. Lacking power of speech; SYN. tongueless.

1. Cool and formal in manner; SYN. restrained, reticent, unemotional.
2. Marked by self-restraint and reticence.
3. Set aside for the use of a particular person or party.

ETYM French secret (cf. Spanish and Portu. secreto, Italian secreto, segreto), from Latin secretus, p. p. of secernere to put apart, to separate. Related to Certain, Secrete, Secern.
1. Communicated covertly.
2. Not expressed; SYN. private.
3. Not open or public; kept private or not revealed.
4. The next to highest level of official classification for documents (before).

Tending to keep secret or private

ETYM Latin silens, -entis, p. pr. of silere to be silent; akin to Goth. ana-silan.
1. Marked by absence of sound; SYN. soundless, still.
2. Having a frequency below or above the range of human audibility.
3. Not made to sound; SYN. unsounded.
4. (Of film) Having no spoken dialogue and usually no soundtrack.

Unable to speak temporarily; SYN. dumb.

ETYM Latin taciturnus: cf. French taciturne. Related to Tacit.
Habitually reserved and uncommunicative.

1. Burrowing marine mollusk living on sand or mud.
2. Flesh of either hard-shell or soft-shell clams.
Common name for a bivalve mollusk. The giant clam Tridacna gigas of the Indopacific can grow to 1 m/3 ft across in 50 years and weigh, with the shell, 500 kg/1,000 lb.
A giant clam produces a billion eggs in a single spawning.<br /> The term is usually applied to edible species, such as the North American hard clam Venus mercenaria, used in clam chowder, and whose shells were formerly used as money by Native Americans. A giant clam may produce a billion eggs in a single spawning.

1. In a stupid manner; SYN. densely, obtusely.
2. In an inarticulate manner.