reserved

Synonyms: aloof backward bashful cautious ceremonious close close-mouthed cold collected composed conventional cool demure diffident distant eremitic formal frigid gentle icy mild misanthropic modest noncommittal offish peaceful placid prim quiet reclusive restrained reticent retiring secretive sedate self-contained serene shy soft-spoken solitary standoffish taciturn unapproachable uncommunicative uncompanionable undemonstrative unresponsive withdrawn

Antonyms: extroverted friendly outgoing sociable

Synonyms: appropriated arrogated booked claimed engaged kept laid away limited preempted private qualified restricted retained roped off set apart set aside spoken for taken

Antonyms: given offered unreserved