Improbable or unlikely.
Experiencing or showing doubt, sceptical.
Subject to, or causing doubt.
Unclear or unreliable.
Suspicious, or of dubious character.
Undecided or of uncertain outcome.
A doubtful person or thing.
Not imaginary; real; actual; true; veritable.
Most important; essential.
Having a substance; actually existing.
Corporeal; material; firm.
Possessed of goods or an estate; moderately wealthy.
Satisfying; having sufficient substance to be nourishing or filling.
Large in size, quantity, or value; ample; significant.
Having good substance; strong; stout; solid; firm.
Anything having substance; an essential part.