Sayonara .
You may say 'oshare' in Japanese; it means "fashionable," "stylish."
yoi or ii
If you meant to say "konichiwa" then it means good afternoon/good day in Japanese :L
Ohao Gozaimasu.
Ohayo (OHIO)
yoi shokuyoku
鬼 /o ni/ is a good Japanese equivalent for what you are looking for.
'ii', or 'yoi'.
You may say 'ii.'
You can say 'ii bousan'.
drei ya gubi