Comfortable is the state of comfort. Both are right, but comfy is more informal. More than 100 answers from native speakers about natural usage and nuances of comfy.
It's just used to place emphasis on. The soft mattress makes it comfy the warm blankets make it cozy|@sushimasters the. Comfy的同義字@sushimasters the best way to understand this is to imagine a very comfortable bed.
Q&a about usage, example sentences, meaning and synonyms of word comfy. Comfortable 的同義字@slato they both mean comfortable, but comfy is a cute informal way to say it this bed is comfortable.