1) An unguarded pawn 2) Frank 3) Lacking protection 4) Lacking protection or a guard 5) Not guarded 6) Open 7) Risking capture 8) Undefended 9) Unprotected 10) Vulnerable 1) Defenceless 2) Open 3) Unwary 4) Vulnerable 
[adj] - lacking protection or a guard
adjective displaying or feeling no wariness; `an unguarded remark`
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 affai...