Know Your Next Word : extraneous
13. extraneous :
unnecessary, irrelevant, extra
To be extraneous is to be extra, but always with the sense of being unnecessary. Extra ice cream would never be extraneous, unless everyone had already eaten so much that no one wanted any more.
The book's feeble plot was buried in a lot of extraneous material about a talking dog.
The soup contained several extraneous ingredients, including hair, sand and a single dead fly.
Extraneous light in the camera spoiled the photograph.
water free of extraneous matter
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