不悪[ashikarazu] don't get me wrong, but ...
意識不明[ishikifumei] unconscious
一心不乱[isshinfuran] wholeheartedly
一定不変[itteifuhen] invariable
運動不足[undoubusoku] insufficient exercise

栄養不足[eiyoubusoku] malnutrition
過不足[kafusoku] excess or deficiency
回復不可能[kaifukufukanou] non-recoverable
気不味い[kimazui] unpleasant
健康不安[kenkoufuan] poor health

圧延鋼[atsuenkou] rolled steel
丸鋼[marukou] round steel bar
協力鋼[kyouryokukou] high-tension steel
鋼管[koukan] steel pipe
鋼玉[kougyoku] corundum

鋼材[kouzai] steel material
鋼索[kousaku] cable
鋼線[kousen] steel wire
鋼鉄[koutetsu] steel

錆びる[sabiru] to rust
錆付く[sabitsuku] to rust together
錆止め[sabidome] rust-proofing
身から出た錆[mikaradetasabi] paying for one's mistakes
不錆鋼[fuseikou] stainless steel

錆び[sabi] rust
金錆[kanasabi] rust
赤錆[akasabi] rust
防錆[bousei] anti-rust
錆色[sabiiro] rust (colour)