とんと

adverb

completely; entirely; utterly

Emphasizes that something is done to the fullest extent or that a state is total. Often used with verbs of stopping, forgetting, or changing.

• 彼かれのことはとんと忘わすれていた。

  I had completely forgotten about him.

• このところとんと雨あめが降ふらない。

  It hasn't rained at all lately.

adverb

not at all; not in the least

Used in negative sentences to mean 'not at all' or 'not a bit'. Often paired with ～ない.

• 彼かれの話はなしはとんと理り解かいできなかった。

  I couldn't understand his story at all.