1660s, "exalted, honored, ranking as a dignitary," past-participle adjective from dignify. By 1812 in the sense of "having a dignified manner, marked with dignity; of noble bearing; grave or stately."
Entries linking to dignified
dignify v.
early 15c., dignifien, "invest with honor or dignity, exalt in rank or office," also "deem suitable," from Old French dignefiier, from Medieval Latin dignificare "make worthy," from Latin dignus "worthy, proper, fitting" (from PIE root *dek- "to take, accept") + -ficare, combining form of facere "to make, do" (from PIE root *dhe- "to set, put"). From mid-15c. as "confer honor upon, give celebrity to, make illustrious." Related: Dignified; dignifying.
undignified adj.
1680s, of clergy, "not holding a position of dignity," from un- (1) "not" + dignified. Meaning "lacking in dignity of manner" is attested from 1782.