anfractuous

As adjectives the difference between anfractuous and complex

is that anfractuous is sinuous, twisty, winding while complex is made up of multiple parts; composite; not simple.

As a noun complex is

a problem.

As a verb complex is

(chemistry|intransitive) to form a complex with another substance.

As adjectives the difference between anfractuous and tortuous

is that anfractuous is sinuous, twisty, winding while tortuous is twisted; having many turns; convoluted.

As adjectives the difference between circuitous and anfractuous

is that circuitous is not direct or to the point while anfractuous is sinuous, twisty, winding.