Nina in spanish means baby...It's the slang word a boyfriend might use for his girlfriend. Your words Nina should have the accent ~ above it. like this: niÃ±a. 'Nina' means girl.
Top definition Temperamental unknown A person that can explode at any given moment, one minute everything can be super-duper and their company that of something wonderful and the next they are loathsome.
The manner of thinking, behaving, or reacting characteristic of a specific person: a nervous temperament. See Synonyms at disposition. b. The distinguishing mental and physical characteristics of a human according to medieval physiology, resulting from dominance of one of the four humors.