怠
dài
idle
lazy; negligent; careless
他做事从不懈怠，每天都很努力。
tā zuò shì cóng bù xiè dài，měi tiān dōu hěn nǔ lì。
He is never slack in his work and tries hard every day.
工作越忙越不能怠慢，要保持认真的态度。
gōng zuò yuè máng yuè bù néng dài màn，yào bǎo chí rèn zhēn de tài dù。
The busier the work, the less you can be negligent — you must maintain a serious attitude.