standoffish (adj.)

• aloof
• backward
• bashful
• blank
• chilly
• cold
• constrained
• cool
• detached
• discreet
• distant
• eremitic
• exclusive
• expressionless
• forbidding
• frigid
• frosty
• guarded
• haughty
• highfalutin
• icy
• impassive
• impersonal
• inaccessible
• introverted
• lordly
• misanthropic
• modest
• offish
• pompous
• reclusive
• remote
• removed
• repressed
• reserved
• restrained
• reticent
• retiring
• shrinking
• snooty
• solitary
• subdued
• suppressed
• unapproachable
• uncongenial
• undemonstrative
• unexpansive
• unfriendly
• unsociable
• unsocial
• withdrawn