Synonyms for redundant

Most common

1. Superfluous — superfluous; exceeding what is necessary (and therefore no longer needed because other things fulfill its…

2. Tautological

Other

adj. 1
Superfluous; exceeding what is necessary (and therefore no longer needed because other things fulfill its task or purpose).
adj. 2
Repetitive or needlessly wordy.

unnecessary The facts proved that our worries were unnecessary.
pointless It's pointless to try to stop Tom from doing that.
superfluous I agree that the feelings are indeed superfluous.
unneeded Unneeded gifts can be re-gifted.
wordy It could've been said in a less wordy way.
tautological Tom tautologically said that tautological tautology is tautological.

Use in printed books, per decade from 1850 to 2019.

5 letters: extra², spare¹, wordy²
6 letters: excess², prolix
7 letters: surplus², diffuse², copious³, verbose, profuse²
8 letters: needless², prodigal³, unneeded³
9 letters: excessive³, pointless², exuberant⁴, expletive³, plethoric
10 letters: repetitive⁴, expendable⁴, pleonastic, tautologic
11 letters: unnecessary⁵, extravagant⁴, superfluous³, inessential, reredundant
12 letters: tautological, adscititious
13 letters: supernumerary, superabundant
14 letters: supererogatory

The small number after each word is its number of syllables (extra² = 2 syllables).