Kawaii -> delete the last 'i'
Kawai  -> add 'kunai'
Kawaikunai -> to do Ranma speak, change 'nai' to 'nee'
Kawaikunee

AH! Conjagating verbs! AH! Why I never passed French in Jr. High School!
Oh well, this seems to make more sense....

Maybe people will PAY ATTENTION this time?!

Kun-chan...