frailty, n. [fragility], frangibility, [brittleness]; [imperfection], [fault], [defect].
frame, v. [devise], [plan], [contrive], compose; invent, fabricate; adjust, [fit], conform.
framework, n. [frame], skeleton.
frank, a. [candid], [unreserved], [outspoken], ingenuous, undisguised.
frankness, n. [candor], [unreserve], ingenuousness.
frantic, a. [distracted], [frenzied], crazed, [raving].
fraternal, a. [brotherly].
fraternity, n. [brotherhood], brotherliness.
fraud, n. [imposture], [deceit], [humbug], duplicity, imposition, [chicanery], [wile], circumvention, [guile], [hypocrisy], malversation, [graft], surreption. Associated words: collude, collusion, collusive, connivance.
fraudulent, a. [deceptive], [wily], [crafty], [subtle], surreptitious, [knavish].