introverted (adj.)

• aloof
• backward
• bashful
• blank
• chilly
• cold
• constrained
• cool
• detached
• discreet
• distant
• expressionless
• forbidding
• frigid
• frosty
• guarded
• icy
• impassive
• impersonal
• inaccessible
• introversive
• inverted
• modest
• offish
• remote
• removed
• repressed
• reserved
• restrained
• reticent
• retiring
• reversed
• shrinking
• standoffish
• subdued
• subjective
• suppressed
• topsy-turvy
• transposed
• unapproachable
• uncongenial
• undemonstrative
• unexpansive
• upside-down
• withdrawn