Explanation
Completely not; not at all.
Formation
まったく + Verb-negative, まったく + い-Adjective-negative, まったく + な-Adjective-negative
Detailed explanation
The まったく～ない grammar point is used to express that something is not the case at all, or to emphasize the negativity of a situation or action. It is used with negative forms of verbs, い-adjectives, and な-adjectives. It can be translated as 'completely not' or 'not at all' in English.
Examples
彼は、まったく覚えていない。
Kare wa, mattaku oboete inai.
He doesn't remember at all.
この部屋はまったく暖かくない。
Kono heya wa mattaku atatakakunai.
This room is not warm at all.
彼女はまったく遅れていない。
Kanojo wa mattaku okurete inai.
She is not late at all.
これはまったく便利ではない。
Kore wa mattaku benri de wa nai.
This is not convenient at all.
Practice
Grammar content sourced from hanabira.org.