A doubtful person or thing.
Experiencing or showing doubt, sceptical.
Subject to, or causing doubt.
Improbable or unlikely.
Unclear or unreliable.
Suspicious, or of dubious character.
Undecided or of uncertain outcome.
A person whose abilities are less than normal.
That part of the axis of a curved line which is intercepted between the ordinate and the normal.
denormal
Less than normal.