comfy
Feeling pleasantly relaxed, cozy, and at ease.
Comfy is a casual, friendly way to say comfortable. When your favorite pajamas feel soft and cozy, they're comfy. When you curl up in an armchair with a good book and feel perfectly relaxed, that's a comfy spot.
The word carries a sense of ease and contentment. A comfy bed invites you to sink in and relax. Comfy shoes don't pinch or rub. A comfy sweater feels like a warm hug. People also use it to describe situations: you might feel comfy around your best friend because you can be yourself without worrying.
Notice that comfy suggests something pleasantly informal. You'd describe your worn-in sneakers as comfy, but you probably wouldn't call a fancy suit or an elegant ballgown comfy, even if it fits well. The word has a relaxed, homey quality to it.
Sometimes people get too comfy, meaning they've become so comfortable in a situation that they stop trying or paying attention. A soccer player who gets too comfy with their skills might stop practicing and lose their edge. But mostly, finding something comfy, whether it's a reading nook or a friendship, is one of life's small pleasures.