free from reserve, restraint, or dissimulation; candid; sincere.

artless; innocent; naive.

Obsolete . honorable or noble.

adjective

deceitful , dishonest , sly

adjective

artless , candid , childlike , frank , green * , guileless , innocent , like a babe in the woods , naive , natural , open , outspoken , plain , simple , sincere , square , straightforward , trusting , unaffected , unartful , unartificial , undisguised , unreserved , unschooled , unsophisticated , unstudied , up frontnotes:ingenious is \'clever , brilliant\'; ingenuous is \'frank , candid\' or \'nave\'ingenuous means \'nave , easily deceived , unsuspecting; foolish\' - and disingenuous means \'calculating , deceptive\' , unworldly , direct , downright , forthright , honest , man-to-man , plainspoken , straight , straight-out , naif , trustful