Involving or requiring strenuous effort; difficult and tiring.
ardu+ous
Shared component: ardu · steep
OpenEtymologyWORD FAMILY
ardu
steep
Related forms: ardu · 2 words in this dictionary
Related words
Shared components, not spelling prefixesIn a way that involves or requires strenuous effort; difficult and tiring.
ardu+ous+ly
Shared component: ardu · steep