This is the 5715th most frequent Turkish word.
saf
Pure; innocent; naive.
In this sentence, "saf" is used to mean "pure" or "unmixed," referring to the purity of the water.
Bu su tamamen saf ve içilebilir.
This water is completely pure and drinkable.
Here, "saf" describes a person's characteristic of being naive or overly trusting.
O çok saf bir kişidir, herkese hemen inanır.
He is a very naive person; he immediately believes everyone.
In this context, "saf" means "genuine" or "honest," contrasting genuineness with deceitfulness.