непоколебимый
perpetuus [a, um]
учебный
scholaris [e];
scholicus
гибкий
tractabilis [e] (vox);
decrepitus [a, um] ; aetate confectus [a, um] ; vietus [a, um] (senex); vetus [e]ris; imbecillis [e]; cariosus [a, um] (carisa senectus);
+ дряхлый старик silicernium;