This is the 12237th most frequent Turkish word.
haini
Traitor.
In this sentence, 'haini' (as 'hain', its base form) is used as an adjective to describe the nature of 'words' (sözleri). It reflects their deceitful or betraying character.
O eski dostumun söylediği hain sözleri duydum.
I heard the treacherous words spoken by my old friend.
In this example, 'haini' is employed as a noun in accusative case, referring to a person known for betrayal or treachery, highlighting skepticism towards their honesty.
Kim bir hainin doğru söyleyebileceğini düşünür ki?
Who would think that a traitor could speak truthfully?
Here, 'haini' ('hain', in nominative form) is used as a noun, describing someone who betrays or acts treacherously, specifically towards their country.