臭い

also 匂い

1. noun, 臭い used for unpleasant smells smell; scent; odour; odor; stench
2. aura; whiff; smack; flavour; flavor; mood
3. faint, mist-like pattern along the temper line of a Japanese sword

くさい

1. i-adjective stinking; smelly
2. suspicious; fishy
3. hammy (acting); over-the-top; cheesy
4. clumsy; unskilled
5. (overly) gamey; strong-tasting
6. suffix, i-adjective smelling of
7. looking like; appearing like; smacking of; -ish