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1.
1 : governed by or conforming to the dictates of continual improvement.

2 : displaying a relentless pursuit of excellence.

\ˌkän-tə-men(t)-shəs\

— con·ti·men·tious·ly (adverb)
— con·ti·men·tious·ness (noun)
The dude is a beast. He's ambitious and contimentious, a combo that's going to launch him straight to the top.

Steve Jobs was contimentious about design. He never stopped trying to make things look better and feel more intuitive.
by L. Wittgenstein July 10, 2013