challenging

English Thesaurus

1. requiring full use of your abilities or resources (adj.all)

similar	:	difficult, hard,
definition	:	not easy; requiring great physical or mental effort to accomplish or comprehend or endure (adj.all)

2. disturbingly provocative (adj.all)

similar	:	provocative,
definition	:	serving or tending to provoke, excite, or stimulate; stimulating discussion or exciting controversy (adj.all)

3. stimulating interest or thought (adj.all)

similar	:	stimulating,
definition	:	rousing or quickening activity or the senses (adj.all)

4. requiring full use of your abilities or resources (adj.all)

derivation	:	ambition, aspiration, dream,
definition	:	a cherished desire (noun.feeling)

derivation	:	ambition, aspiration, dream,
definition	:	a cherished desire (noun.feeling)