ばか， バカ， 馬鹿， 莫迦
1. idiot, moron, fool
2. stupid, foolish, dull, absurd, ridiculous
3. trivial, insignificant, disappointing
4. malfunctioning, defective, losing sensation
5. incredibly, unusually, exceptionally
6. fervent enthusiast, nut, person singularly obsessed ...
tbd