Being beyond what is required or sufficient.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "superfluous" in a sentence
"I think a good deal of what you call superfluous condolence would come under the head of superfluous criticism."
"But an interpretation of the Necessary and Proper Clause that gives Congress virtually unlimited power and renders most of the rest of Article I superfluous is surely “improper” if anything is."
"If he wishes to assert a dual common source (both God and Q) then that's his prerogative but I would cite this as superfluous from a scriptural perspective."