from Wiktionary, Creative Commons Attribution/Share-Alike License.
comparativeform of muscly: more muscly
Sorry, no etymologies found.
Keeping track of it has also been useful, since the organization part comes naturally and the results are obvious: I swam a ton, I lost some weight, I have been happier, I am musclier.
Bigger art, brighter colors, nakeder girls, musclier heroes, all fighting to make a bigger splash on the newsstand.