不懈 | bù xiè | untiring; unremitting; indefatigable | |
松懈 | sōng xiè | to relax; to relax efforts; to slack off; to take it easy; complacent; undisciplined | |
懈怠 | xiè dài | slack; lazy; remiss | |
无懈可击 | wú xiè kě jī | (idiom) impossible to fault; impeccable | |
常备不懈 | cháng bèi bù xiè | always on alert (idiom) |