nonsense

NONSENSE noun

[ U ] uk/ˈnɒnsəns/ us nonsense noun [U]
(BEHAVIOUR)

silly behaviour

глупое поведение, сумасбродство
Will you stop this childish nonsense ! make a nonsense of sth UK
to spoil something or make it seem stupid

превращать что-либо в бессмыслицу
Cuts to the text made a nonsense of the play.