What is sincerity in Greek?

There isn't one single perfect translation for "sincerity" in Greek, as the best word depends on the nuance you want to convey. However, here are a few options with slightly different connotations:

* Ειλικρίνεια (eilikrinia): This is probably the closest single word translation and is generally understood as sincerity, honesty, and frankness. It emphasizes truthfulness and genuineness of feeling.

* Γνησιότητα (gnisiotita): This word means authenticity or genuineness. It highlights the pure and unadulterated nature of something, which can be relevant to sincerity.

* Ακεραιότητα (akeraiotita): This translates to integrity. While not directly "sincerity," a person with integrity is often sincere.

* Ειλικινής (eilikinis): This is the adjective form of ειλικρίνεια, meaning sincere, honest, or frank. You'd use this to describe a person or their actions.

The best choice will depend on the context. For most situations, ειλικρίνεια (eilikrinia) is a safe and accurate choice.