significative

As an adjective significative

is that tends to signify or indicate; indicative.

As an adverb significantly is

in a significant manner or to a significant extent.

As adjectives the difference between evocative and significative

is that evocative is that evokes (brings to mind) a memory, mood, feeling or image; redolent or reminiscent while significative is (usually followed by of) that tends to signify or indicate; indicative.