doubtful meaning

See: ambiguity
References in classic literature ?
Have I not explained everything to you with respect to myself which could bear a doubtful meaning, and which the ill-nature of the world had interpreted to my discredit?
Needed close and independent examination is rarely accorded, so the dubious worth and doubtful meaning of statistical studies goes unnoticed.
Heskey and Carlton Cole are both sidelined from injuries picked up in Saturday's 4-0 stroll against Slovakia and Peter Crouch is doubtful meaning Wayne Rooney is the only fully-fit striker from the original squad, although Darren Bent has been called up.