IPA: /ˈkʌmfərtəblnəs/
KK: /ˈkʌmfərtəblnəs/
The state of being relaxed and free from discomfort or pain.
The comfortableness of the new sofa made it my favorite place to relax.
Comfortableness → It is formed from "comfort" (from Latin "comfortare", meaning to strengthen or console) and the suffix "-able" (meaning capable of) and "-ness" (meaning the state of). The word "comfortableness" refers to the state of being capable of providing comfort or ease.
Think of 'comfort' as providing strength or consolation, and remember that 'comfortableness' means the state of being able to provide that comfort.