foundationalist

A supporter of foundationalism, the doctrine that beliefs derive justification from certain basic beliefs

So the foundationalist holds that both experiences and beliefs can justify beliefs, whereas the coherentist holds that only beliefs can justify beliefs.

Of or relating to foundationalism.

Some philosophers have objected to certain foundationalist solutions to the regress problem on the ground that a person rarely, if ever, holds given-beliefs of the sort needed to justify observation beliefs.