frank
/ˈfraŋk/
adjective
marked by free, forthright, and sincere expression
unmistakably evident
clinically evident and unmistakable
a frank reply
frank candid open plain mean showing willingness to tell what one feels or thinks. frank stresses lack of shyness or secretiveness or of evasiveness from considerations of tact or expedience. candid suggests expression marked by sincerity and honesty especially in offering unwelcome criticism or opinion.
verb
to mark (a piece of mail) with an official signature or sign indicating the right of the sender to free mailing
to mail free
to affix to (mail) a stamp or a marking indicating the payment of postage
noun
the signature of the sender on a piece of franked mail serving in place of a postage stamp
a mark or stamp on a piece of mail indicating postage paid
a franked envelope