Translation guide
Used for emphasis in negative statements, meaning 'not at all' or 'not even a little.'
Emphasize a complete lack or absence in a negative sentence.
The most direct and common way to say 'not in the least.' Place 少しも before the negative verb or adjective.
彼の話は少しも面白くなかった。
His story was not interesting in the least.
少しも疲れていません。
I'm not tired in the least.
Very common in casual speech. 全然 means 'completely (not)' and pairs with a negative form. Slightly more emphatic than 少しも.
全然気にしていない。
I don't mind in the least.
その映画は全然怖くなかった。
That movie wasn't scary in the least.
Similar to 少しも, but more colloquial. Often used in spoken Japanese.
ちっとも分からない。
I don't understand in the least.
Very emphatic and colloquial, meaning 'not even a tiny bit.' Often used when complaining or denying strongly.
これっぽっちも面白くない。
It's not interesting in the least.
The English phrase 'in the least' cannot be translated word-for-word into Japanese. Always use a negative polarity adverb like 少しも or 全然 with a negative verb/adjective.
少しも is slightly more formal and literal ('not even a little'), while 全然 is more common in casual speech and can sound stronger. Both are perfectly natural in negative sentences.