Decide whether the following statement is true or false, based on your understanding of the stylistic features of idioms.
Stylistically speaking, most idioms are neither formal nor informal.

Decide whether the following statement is true or false, based on your understanding of the stylistic features of idioms.
Stylistically speaking, most idioms are neither formal nor informal.

False. Idioms are generally felt to be informal and some are colloquialisms and slang, therefore inappropriate for formal style. Occasionally we find idioms which are extremely formal and used only in frozen style.