Similar words: spend money like water, backwater, like a fish out of water, water of hydration, matter-of-fact, matter of fact, as a matter of fact, water buffalo.
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1) That guy is hopeless. All my admonitions are like water off a duck's back.
2) The scolding ran off him like water off a duck's back.
3) Criticism falls off her like water off a duck's back.
4) Their criticisms of his talk rolled off him like water off a duck's back.
5) Advice and correction roll off him like water off a duck's back.
6) He has such a high opinion of himself that criticism flows off him like water off a duck's back.
7) Jack't care what people say. Criticism rolls off him like water off a duck's back.
8) To the seasoned campaigner, the remarks of hecklers were like water off a duck's back.
9) He always forgets something which his friends said, maybe's like water off a duck's back.
More similar words: spend money like water, backwater, like a fish out of water, water of hydration, matter-of-fact, matter of fact, as a matter of fact, water buffalo, likewise, tidewater, wastewater, above water, surface water, spread like wildfire, throw cold water on, rucksack, turn one's back on, backslid, backside, backslap, backspace, backstage, backslide, stonewall jackson, backstroke, back street, behind someone's back, backsliding, play ducks and drakes, huckster.