There won’t be much tension to mitigate when you’re with someone congenial. “Congenial” means “having the same likes and dislikes”. You and your best friend are likely congenial kindred spirits. If you’re in a group of people who enjoy the same thing – for example, an activity like skiing, or singing in a choir – then you’re in congenial company. You can also be in a congenial situation: one where you’re completely in your comfort zone, surrounded by affable people, even if you’re not a part of any particular group.

Example: “Being a music lover, I found myself in congenial company at the opening of the Sydney Opera House’s new season.”