What is prefix for founded?

Answer 1

The word founded is the past participle of the verb to found (founds, founding, founded).

The noun form for the verb to found is founding; the present participle of the verb (an -ing word) is a verbal noun called a gerund.

Answer 2

The abbreviation for founded, oddly enough, is actually Founded spelled exactly the same but with a capital "f".

Answer 3

You could add the prefix un- to founded to get unfounded.

Answer 4

find