restrained

adjectives

cool and formal in manner
restrained, reticent, unemotional
under restraint
restrained
antonym
unrestrained
is similar to
strictly confined or guarded
"kept under close custody"
close
is similar to
restrained in style or quality
"a little masterpiece of low-keyed eloquence"
low-key, low-keyed, subdued
is similar to
not given to high spirits or effusiveness
"an unexpansive man"
unexpansive
see also
restrained or managed or kept within certain bounds
"controlled emotions"; "the controlled release of water from reservoirs"
controlled
see also
held back or restrained or prevented
"in certain conditions previously inhibited conditioned reactions can reappear"
inhibited
see also
marked by self-restraint and reticence
"was habitually reserved in speech, withholding her opinion"-Victoria Sackville-West
reserved
marked by avoidance of extravagance or extremes
"moderate in his demands"; "restrained in his response"
moderate, restrained
not showy or obtrusive
"clothes in quiet good taste"
quiet, restrained
prudent
"guarded optimism"
guarded, restrained