IPA: /ˈkʌmf.tə.bəl/
KK: /ˈkʌmfərtəbəl/
Feeling relaxed and free from pain or worry; providing a sense of ease and security.
After a long day, I love to sit in my comfortable chair and read a book.
Comparative: more comfortable
Superlative: most comfortable
Comfortable → It is formed from "com-" (meaning with or together) and "fortis" (meaning strong or firm) combined with the suffix "-able" (meaning capable of). The word "comfortable" means capable of providing a strong sense of ease or well-being when together with something.
Think of being 'with' ('com-') something 'strong' ('fortis') that makes you feel at ease — that's what comfortable means.