budaletina

1. colloq. derog. (of a person) big fool; oaf
   Kakva si ti budaletina, opet si zaboravio ključeve! — What a big fool you are, you forgot the keys again!
   Ne slušaj tu budaletinu, ništa ne zna. — Don't listen to that oaf, he knows nothing.

Feminine noun used of men as well as women; modifiers usually have feminine agreement (ta budaletina, velika budaletina), while a predicate and a following pronoun may be masculine when referring to a man.