"muscularity" in the noun sense
1. muscularity
the physiological state of having or consisting of muscle
2. brawn, brawniness, muscle, muscularity, sinew, heftiness
possessing muscular strength
3. energy, muscularity, vigor, vigour, vim
an imaginative lively style (especially style of writing
"his writing conveys great energy"
"a remarkable muscularity of style"
Source: WordNet® (An amazing lexical database of English)
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