頑丈 がんじょう
ganjō

Noun
na-Adjective

1. solid; firm; stout; burly; strong; sturdy

これは けるのにたいそう頑丈 がんじょうないすだ。
korewa kakerunoni taisō ganjōna isuda.
This is a very sturdy chair to sit in.
Other forms: