懈

松懈

sōng xiè

to relax

不懈

bù xiè

untiring

不懈怠

bù xiè dài

untiring

坚持不懈

jiān chí bù xiè

(idiom) to persevere unremittingly; to keep going until the end

夙夜匪懈

sù yè fěi xiè

to work from morning to night (idiom)

懈弛

xiè chí

slack (discipline)

懈怠

xiè dài

slack

懈惰

xiè duò

slack

懈气

xiè qì

to slacken off

无懈可击

wú xiè kě jī

(idiom) impossible to fault