ଅର୍ଥ : Requiring full use of your abilities or resources.
ଉଦାହରଣ :
Ambitious schedule.
Performed the most challenging task without a mistake.
ସମକକ୍ଷ : ambitious
ଅର୍ଥ : Stimulating interest or thought.
ଉଦାହରଣ :
A challenging hypothesis.
A thought-provoking book.
ସମକକ୍ଷ : thought-provoking