1. not a little - Adverb
2. not a little - Determiner
not a little (not comparable)
Much, very; considerably.
He is not a little saddened at the departure of the Dodgers. He's thinking of moving from Brooklyn to Los Angeles.
not a little
Much, no little, more than a little.
Not a little ink has been spilled on this issue.
Seldom, very seldom, does complete truth belong to any human disclosure; seldom can it happen that something is not a little disguised, or a little mistaken. Jane Austen
Let's be perfectly clear, shall we. The fox is not a little orange puppy dog with doe eyes and a waggly tail. It's a disease-ridden wolf with the morals of a psychopath and the teeth of a great white shark. Jeremy Clarkson
This Knight was indeede a valiant Gent: but not a little given to romance, when he spake of himselfe. John Evelyn
To be full of joy when looking at an oeuvre is not a little thing. Jean Arp
A piece of land is not a little thing. Kikuyu Proverb
He does not a little who burns his house: he frightens the rats, and warms himself. Spanish Proverb