不少
bù shǎo
many
a lot; not few
not (不) + few (少) = quite a lot
A double negative that flips scarcity into abundance. If something is not few, there must be plenty of it.
他有不少朋友。
tā yǒu bù shǎo péng yǒu。
He has quite a few friends.
这道题难倒了不少学生。
zhè dào tí nán dǎo le bù shǎo xué shēng。
This problem stumped a lot of students.