This is the 45th most frequent Turkish word.
değil
"Değil" means "not" in English.
Here, 'değil' is used to negate the adjective 'new', indicating the car lacks the quality of being new.
Bu araba yeni değil.
This car is not new.
In this sentence, 'değil' negates the noun 'my friend', showing that the person does not hold that particular identity or role.
Onunla konuşmadım, çünkü o benim arkadaşım değil.
I didn't talk to him because he is not my friend.
Here, 'değil' negates the adjective 'nice', stating the weather lacks the described quality.