Synonyms for Superfluous:

adj.

extra, unnecessary (adjective)
gratuitous, needless, exorbitant, supererogatory, lavish, unneeded, redundant, inordinate, supernumerary, abounding, spare, in excess, overflowing, unwanted, extreme, surplus, dispensable, superabundant, overmuch, excess, excessive, extravagant, profuse.
inordinate (adjective)
overindulgent.
superfluous (adjective)
outrageous, extravagant, gratuitous, excessive, immoderate, copious, redundant, superabundant, overabundant, overindulgent, surplus, overflowing, exorbitant.
unnecessary (adjective)
unneeded.
useless (adjective)
otiose.
wordy (adjective)
grandiloquent, windy, long-winded, featherbedding, endless, chatty, wordy, talkative, loquacious, excessive, verbose, lengthy, wandering, bombastic, ponderous, rambling.

n.

unlooked-for, unasked for, dispensable, unsolicited, uninvited, unwanted. superfluity (noun)
overkill, overindulgence, gratuitousness, exorbitance, outrageousness, deluge, landslide, surplus, excessiveness, avalanche, copiousness, Overrunning, superabundance, inundation, glut, extravagance, overdose, overabundance, immoderation, redundancy.
superfluous (noun)
spare, otiose, pointless, wasted, redundant, excess, surplus, unnecessary, supererogatory, unneeded, worthless, supernumerary, extra.
unnecessary (noun)
abounding, needless, Turgescent, extreme, overcharged, overmuch, inordinate, profuse, in excess, lavish, very great.

Other synonyms:

unlooked-for, unasked for, dispensable, unsolicited, uninvited, unwanted.

Usage examples for superfluous

  1. He could not think her superfluous and she was very good- natured. – April Hopes by William Dean Howells Last Updated: February 27, 2009
  2. He did not believe the truth of Bunty's final remark, but still he considered there was sufficient probability in it to make a visit to the shed not altogether superfluous – Seven Little Australians by Ethel Sybil Turner
  3. Everyone seemed to take Rachel's help for granted, and to think it superfluous to thank her. – The Heart of Una Sackville by Mrs. George de Horne Vaizey