challenge
n. countablen. something that is difficult to do and tests your skills or strength. You often feel proud after you finish it.
n. a task or situation that tests someone's abilities; a demanding or stimulating undertaking. Often used to describe a difficulty that is viewed as an opportunity for growth.
Learning a new language is a big challenge.
The team faced the challenge of finishing the entire project in just two weeks.
While the initial phase of the research was straightforward, the real challenge lay in interpreting the vast amount of data collected during the final months of the study.
From Middle English chalenge, variant with palatalization of Middle English kalange (“an accusation, claim”), from Old French chalenge, chalonge, palatalized Central French variants of Old Northern French calenge, calonge (see Continental Norman calengier), from Latin calumnia (“a false accusation, calumny”). Cognate with Old English hōl (“calumny”). Doublet of calumny.
Commonly takes the prepositions 'to' or 'for' when describing the person or group affected.