adverb
(not) at all; (not) a bit; (not) in the least
Used with a negative predicate to mean 'not even a little'. Stronger than あまり~ない and closer to 全然~ない in everyday speech.
彼の言っていることは少しもわからない。
I don't understand what he's saying at all.
少しも疲れてい
I'm not tired in the slightest.