of a person) pleasant to spend time with because their interests and character are similar to your own (Oxford)
(to somebody) (of a place, job, etc.) pleasant because it suits your character (Oxford)
(to something) (formal) suitable for something (Oxford)
friendly and pleasant (Cambridge)
His studies in Leiden proved congenial to him. (Oxford)
He is a congenial colleague. (Oxford)
We spent a relaxed evening with congenial friends. (Cambridge)
studies proved congenial to him
a congenial colleague
spent a relaxed evening with congenial friends
Affable
Agreeable
Cold
Harsh
Congenial