Modifies a noun

• truth: Although Sartre takes the Cartesian to be an indubitable truth he has little time for any resulting doubt about things in the world.

• knowledge: In this may we may attain indubitable knowledge which is not derived from the sensory realm.

• evidence: The poetry is indubitable evidence of the cruel tale being founded on fact.

• certainty: A kind of ' indubitable certainty ' which claims to possess knowledge is all part of our alienation from God.

• foundation: Modernist thought strives for a closed, inclusive philosophy resting on indubitable foundations.

• sign: An indubitable sign, if ever there could be one, that the artists of OUCC are not about to go quietly.