Wiktionary
comfortablest
a. (en-superlative of: comfortable)
Usage examples of "comfortablest".
Boston is one of the grandest, sure-footedest, clear headedest, comfortablest cities on the globe.
Woolwich that of all the things my Woolwich could have to think of when he grew to be a man, the comfortablest would be that he had never brought a sorrowful line into his mother's face or turned a hair of her head grey, then I felt sure, from his way, that something fresh had brought his own mother into his mind.
The newest guy's still sitting in the linen closet claiming he's comfortablest there with the door open and the new 'helpless' Amy Johnson hasn't come back yet.