ちっとも
ちっとも · chittomo · JLPT N4 · adverb
not at all (neg. verb)
chitto = a tiny bit + mo = even: not even a tiny bit
ちっと is a casual form of ちょっと (a little), and も means even. With a negative verb it reads as not even a little, i.e. not at all. Same pattern as 少しも, just more colloquial.