“Sturdily built” in Japanese
Short answer
Sturdily built in Japanese is “骨太” (honebuto). Full meaning: big-boned, sturdily built, stout; solid (plan, storyline, etc.).
Other ways to say “Sturdily built” in Japanese
骨ぶと
honebuto big-boned, sturdily built, stout; solid (plan, storyline, etc.)
ほねぶと
honebuto big-boned, sturdily built, stout; solid (plan, storyline, etc.)
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