bad - mauvais
The way to say "bad" in french is mauvais (masculine) or mauvaise (feminine)
a bad word is 'un mot grossier', 'une grossièreté' in French.
"Pas mal" is how you say "not bad" in French.
To say the word "I" in French, one would say "je."
Bad is translated 'mauvais, mauvaise' in French.
In French, the word on is sur.
In French, the word "he" is Il.
The verb 'to say' is 'dire' in French.
To say the word enthusiastic in French you say the word enthousiaste. In the Italian language this word is said as entusiasta.
If you mean literally with spikes, garni de pointes, should work. If you want the British slang meaning bad-tempered, the French word is chatouilleux or ombrageux.
"Word" in French is "mot" pronounced "moh"
you say it in a french accent