It's not like deci-meter. The root of decimal is decim. Adding -al to it makes it an adjective.
9.0
De-ci-mal
Mal means bad, or badly.
Mal voisin means bad neighbour
Darth maul mal is Spanish for bad, as in "not good." The opposite of good.
mal
"mal-aimée" (masculine: mal-aimé) means "badly-loved" in French.
"Mal Vriende" Literally means "Crazy Friends" "Mal" means crazy but can also be slang for Cool
Pas mal means 'not bad' in French.
j'ai mal à l'épaule - my shoulder hurts/is hurting me
Spelt 'Que mal' in Spanish, it menas How awful! or That's awful!
Mal