冗 - superfluous, uselessness

joke; jest; funny story

half joking; being (only) half serious; (in a) jocular vein

jokingly; in the form of a joke

fully redundant

seriously; no kidding; joking aside; in all seriousness

redundant system (string, line)

superabundance

chatter; useless words

tedious; verbose; wordy; lengthy; longwinded; prolix

redundancy

unnecessary expense

redundancy