Comparative form of stocky: more stocky(adjective)
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Use "stockier" in a sentence
"They were stockier than Homo sapiens and had thicker bones and protruding foreheads."
"The stockier Brown, on the other hand, spoke with more ominous tones."
"The black vulture (Coragyps atratus) is a shorter, stockier bird (without any red on its head) that is nevertheless heavier than the turkey vulture and dominant to it when competing for a carcass."