nonsense

nonsense /ˈnɑːnˌsɛns/ noun
nonsense
/ˈnɑːnˌsɛns/
noun
Britannica Dictionary definition of NONSENSE
[noncount]
1 
: words or ideas that are foolish or untrue
2 
: behavior that is silly, annoying, or unkind
— see also no-nonsense
3 
: 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)