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nonsense

nonsense /ˈnɑːnˌsɛns/ noun
nonsense
/ˈnɑːnˌsɛns/
noun
Britannica Dictionary definition of NONSENSE
[noncount]
: words or ideas that are foolish or untrue
: behavior that is silly, annoying, or unkind
see also no-nonsense
: language that has no meaning
often used before another noun

make (a) nonsense of

British
: to cause (something) to no longer be effective : to take away the value or usefulness of (something)