Cannot help doing something; instinctively or involuntarily, often used in phrases like 不由得 bù​yóu​de or 不由自主 bù​yóu​zì​zhǔ

To not permit someone to do something; beyond someone's control.

(literary) to not go by way of; to not follow a certain path or method.

To not require or need something; effortlessly or without needing