the true or actual state of a matter

He tried to find out the truth.

conformity with fact or reality; verity

the truth of a statement.

a verified or indisputable fact, proposition, principle, or the like

mathematical truths.

the state or character of being true.

actuality or actual existence.

an obvious or accepted fact; truism; platitude.

honesty; integrity; truthfulness.

( often initial capital letter ) ideal or fundamental reality apart from and transcending perceived experience

the basic truths of life.

agreement with a standard or original.

accuracy, as of position or adjustment.

Archaic . fidelity or constancy. ?

in truth

in reality; in fact; actually

In truth, moral decay hastened the decline of the Roman Empire.

adjective

counterfactual , specious , spurious , untrue , untruthful , wrong