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1. Under restraint
    
2. Cool and formal in manner
   - reticent, unemotional
    
3. Marked by avoidance of extravagance or extremes
   "restrained in his response";
   - moderate, mod [informal]
    
4. Not showy or obtrusive
   "clothes in restrained good taste";
   - quiet
    
5. Prudent
   "restrained optimism";
   - guarded

1. To close within bounds, or otherwise limit or deprive of free movement
   - confine, hold, constrain
    
2. Restrict (someone or something) so as to make free movement difficult
   - encumber, cumber [archaic]
    
3. Prevent (someone or something) from doing something
   "security guards restrained the reporter from throwing another shoe"
    
4. Prevent the action or expression of
   "she struggled to restrain her impatience at the delays";
   - keep, keep back, hold back

See also: cautious, close, controlled, inhibited, low-key, low-keyed, reserved, subdued, temperate, undemonstrative, unexpansive, unostentatious, unpretending, unpretentious

Type of: bound, confine, disable, disenable, incapacitate, keep, limit, prevent, restrict, throttle, trammel

Antonym: unrestrained

Encyclopedia: Restrain