na-adjective, noun
solidly built; stocky
Describes a person who is overweight but firm and muscular rather than flabby. Often used for a sturdy, thick-set build.
彼は堅太りで、見た目よりずっと力がある。
He is solidly built and much stronger than he looks.
相撲取りはたいてい堅太りだ。
Sumo wrestlers are usually stocky and solid.
Compound of 堅 (かた, 'hard, firm') and 太り (ぶとり, 'fatness, plumpness'), literally 'firm fatness'.