Piquant

piquant (ˈpiːkənt; -kɑːnt) 
adj
1. having an agreeably pungent or tart taste
2. lively or stimulating to the mind
[C16: from French (literally: prickling), from piquer to prick, goad; ]
ˈpiquancy, ˈpiquantness n
ˈpiquantly adv

CITE: thefreedictionary.com