na-adjective
tall and stout; clear and well-defined
Rare literary adjective describing something that is both tall and stout, or clear and well-defined in shape. Often used for mountains, trees, or imposing figures. Modern usage is very limited.
いよやかな山が遠くに見える。
A tall, stout mountain is visible in the distance.
彼はいよやかな体格の持ち主だ。
He has a tall and stout build.