The word that best suits weird in Japanese is HEN which writes in Kanji as 変.
Henna hitoga iru!
“There’s a weird person.”
When you look at Kanji HEN, some Japanese may imagine the 変質者, which means pervert. So It isn’t nice to say HEN NA HITO to the other party.
Kono pan ha hennaazi ga suru
“This bread tastes weird.”