Word:

. quotient: 'kwoufnt (the result of one when one number is divided by another )

  Your intelligence quotient is really low.

. moron: 'm)ra:n (is a offensive way to refer sb that you think is very stupid)

  You're such a moron.

  - moronic: me'ra:nik ( to say sb / their behavior is stupid)

    Her eyesign seem moronic.

. idiot: idiet

  What an idiot.

. empty-headed

. dumb: dvm

- stupid

  I never seen anyone that dumb.

- can't say a word

  He was born deaf and dumb.

- dumbell

. ignorance: ignerens

- a lack of information or knowledge about sth

She kept in ignorance of your husband's  activity.