constrained (adj.)
- aloof
- backward
- bashful
- blank
- bridled
- chilly
- cold
- controlled
- cool
- curbed
- detached
- discreet
- distant
- expressionless
- forbidding
- frigid
- frosty
- guarded
- hushed
- icy
- impassive
- impersonal
- inaccessible
- inhibited
- introverted
- limited
- modest
- noncommittal
- offish
- pent-up
- quelled
- quiet
- remote
- removed
- repressed
- reserved
- restrained
- retarded
- reticent
- retiring
- shrinking
- softened
- stable
- standoffish
- subdued
- suppressed
- tempered
- unapproachable
- uncongenial
- undemonstrative
- unexpansive
- withdrawn
