朽廃

きゅうはい

decay, dilapidation (ruin)

朽壊

きゅうかい

rotting and crumbling

腐朽

ふきゅう

deterioration, rot

不朽

ふきゅう

everlasting, immortal, eternal, immortality, imperishable

若朽

being young yet unambitious; being young but lacking spirit

老朽

ろうきゅう

superannuated, decrepitude

朽ち木

くちき

decayed tree, rotted tree, decayed wood, rotten wood

朽ちる

くちる

to rot, to decay

朽ち葉

くちば

decayed leaves

黄朽葉

きくちば

reddish-yellow (colour); russet

青朽葉

あおくちば

bluish russet

老朽化

ろうきゅうか

aging, wearing out, deterioration

朽ち葉色

くちばいろ くちはいろ

russet, tawny, yellow-brown

不朽不滅

ふきゅうふめつ

everlasting, eternal, immortal, imperishable, undying

乾燥腐朽

かんそうふきゅう

dry rot

永垂不朽

えいすいふきゅう

one's fame or achievements being passed down eternally

朽ち果てる

くちはてる

to rot away, to crumble to dust, to decay completely, to fall to ruins, to rust away

老朽化した

ろうきゅうかした

deteriorated, outworn

不朽の名作

ふきゅうのめいさく

immortal work

蛇に噛まれて朽ち縄に怖じる

へびにかまれてくちなわにおじる

once bitten twice shy, to become over cautious from a bad experience, to be bitten by a snake and thus fear a rotten rope (which resembles a snake)