pertinacious - Dictionary definition and meaning for word pertinacious
pertinacious = pre(before) + teenage : The age before teenage is where a person shows a childish behaviour and is very stubborn in a negative sense.
Per+Tin+Acious-"PER" means "As per sth", TIN(teenager) & teenager r determined to achieve without caring others.So determined to achieve a particular aim despite difficulties/opposition
per-tina -cious (par tina nahin manthi ie., stubborn )
PER (every) TINA (people who prefer fish-fishing to eve-fishing may read it as TUNA :D) CI's (sees) OUS - :-P and i won't entertain no argument against it :-P