Reserved

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solitary, standoffish, taciturn, unapproachable, uncommunicative, uncompanionable, undemonstrative, unresponsive, withdrawn.


Or- 'This car parking space is reserved for the Head Teacher'