indefatigability

No painter ever copied himself with more constancy and indefatigability.

It is because of my own indefatigability in talking about talk about talk that they made me a Knight.

Your mastery of the language, and your indefatigability, would make you infinitely useful in any of these departments.

Owing to the indefatigability of collectors and their persistent and tempting offers, many have left their old homes.

At the Westminster election, his indefatigability against the ministerial favourite came amply into play.

His indefatigability infected his comrades, they became more eager the longer the struggle lasted.