This is the 118th most frequent Greek word.
λίγο
"Λίγο" means "a little" or "a bit" in English.
In this sentence, 'λίγο' is used to indicate a small quantity as an adjective modifying the noun 'ψωμί' (bread).
Θέλω λίγο ψωμί.
I want a little bread.
In this context, 'λίγο' is used adverbially to express a small degree of the state described by 'κουρασμένος' (tired).
Νιώθω λίγο κουρασμένος.
I feel a bit tired.
Here, 'λίγο' functions as an adverb, modifying the adjective 'πιο γρήγορα' (faster) to indicate a slight increase in speed.