1Burly, sturdy, strongly built — describing a robust, muscular physique.
毎日鍛えているだけあって、彼の腕はたくましい。
Sure enough, from training every day, his arms are powerfully built.
久しぶりに会った弟は、すっかりたくましくなっていた。
My younger brother, whom I hadn't seen in a while, had grown quite sturdy.
農作業で鍛えられた、たくましい背中をしている。
He has a brawny back, toughened by years of farm work.
2Indomitable, resolute, strong-willed — not broken by hardship; tough and tenacious in spirit.
戦争で何もかも失っても、人々はたくましく生き抜いた。
Even after losing everything in the war, the people lived on resiliently.
彼女は逆境にもめげない、たくましい精神の持ち主だ。
She has an indomitable spirit that doesn't give in to adversity.
子供たちには、どんな環境でもたくましく育ってほしい。
I want the children to grow up tough, no matter what environment they're in.
3Robust and vigorous — said of strong vitality, appetite, or growth; also used for economic growth, etc.
新興国はたくましい経済成長を続けている。
Emerging economies continue to post robust growth.
病み上がりとは思えないほど、たくましい食欲だ。
He has such a hearty appetite you'd never think he'd just recovered from being ill.
踏まれても伸びてくる、たくましい雑草の生命力に驚く。
I'm amazed at the tenacious vitality of weeds that grow back even after being trampled.