adjective sturdier -·dier, sturdiest -·di·est

1. that will not yield or compromise; firm; resolute sturdy defiance
2. physically strong; vigorous; hardy
3. strongly built or constructed

Etymology: ME, defiant, refractory, hardy < OFr estourdi, stunned, reckless (basic sense “hard to influence or control”) < VL *exturdire, to be dizzy (? from too much chattering) < L ex-, intens. + turdus, a thrush

noun

Etymology: OFr estourdi, giddiness: see sturdy