not guarded; unprotected; undefended.

open; frank; guileless

an unguarded manner.

exposed to attack or capture by the opponent without recourse by the player, as a card, chess piece, etc.

an unguarded queen of clubs; an unguarded pawn.

not cautious or discreet; careless

In an unguarded moment he had told her about his affair.

without a safeguard, as a cover, barrier, or shield, for protection

an unguarded buzz saw.

adjective

careful , cautious , thoughtful

adjective

accessible , artless , candid , careless , casual , direct , foolhardy , frank , headlong , heedless , honest , ill-considered , impolitic , imprudent , impulsive , incautious , indiscreet , ingenuous , naive , offhand , rash , spontaneous , straightforward , unalert , uncircumspect , unconscious , undiplomatic , unpremeditated , unreflective , unthinking , unvigilant , unwatchful , unwise , vulnerable , weak , unprotected , unsafe , defenseless , thoughtless , unmindful , unwary