(like) water off a duck's back
C2 criticisms of or warnings to a particular person that have no effect on that person:
I've told him that he's heading for trouble, but he doesn't listen - it's just water off a duck's back.
Thesaurus: synonyms and related words
Useless and futile
- a mug's game idiom
- adrift
- aimless
- airy-fairy
- be at a loose end idiom
- flaccid
- fool's errand
- for the hell of it idiom
- frivolous
- fruitless
- motiveless
- negate
- no good idiom
- nugatory
- ornamental
- use
- useless
- vain
- vainly
- what good is ... idiom
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