YOU SAID:

Mark is a very dumb individual

INTO JAPANESE

マークは非常に間抜けな個人

BACK INTO ENGLISH

Mark is a very stupid person

INTO JAPANESE

マークは非常に愚かな人

BACK INTO ENGLISH

Mark is a very stupid person.

INTO JAPANESE

マークは非常に愚かな人です。

BACK INTO ENGLISH

Mark is a very stupid person.