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.
yoi shokuyoku
Ohayo (OHIO)
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'.
Among others, you may say 'ii.'
(sore wo) kiite yogatta