challenging

Definitions

Testing one's abilities; demanding or difficult.

Inviting competition or confrontation; provocative.

Examples

Learning a new language can be a challenging but rewarding experience.

The team faced a challenging situation when the project deadline was moved up.

Climbing the steep mountain trail proved to be more challenging than we had anticipated.

Synonyms

demanding difficult arduous taxing strenuous testing formidable

Antonyms

easy simple effortless facile manageable straightforward painless