reserved

adjectives

set aside for the use of a particular person or party
reserved
antonym
unreserved
is similar to
reserved in advance
booked, engaged, set-aside
is similar to
subject to being reserved or booked
"all seats bookable in advance"
bookable
marked by self-restraint and reticence
"was habitually reserved in speech, withholding her opinion"-Victoria Sackville-West
reserved
antonym
unreserved
is similar to
remote in manner
"stood apart with aloof dignity"; "a distant smile"; "he was upstage with strangers"
aloof, distant, upstage
is similar to
showing modest reserve
"she was diffident when offering a comment on the professor's lecture"
diffident
is similar to
tending to reserve or introspection
"a quiet indrawn man"
indrawn, withdrawn
see also
(used of temperament or behavior) marked by a retiring nature
"a backward lover"
backward
see also
not given to open expression of emotion
undemonstrative
see also
held back or restrained or prevented
"in certain conditions previously inhibited conditioned reactions can reappear"
inhibited
see also
under restraint
restrained