that will not yield or compromise; firm; resolute: sturdy defiance
physically strong; vigorous; hardy
strongly built or constructed
Origin:
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