1.  stimulating(a = adj.all) - rousing or quickening activity or the senses; "a stimulating discussion"
Antonym: unstimulating

2.  stimulating(s = adj.all) stimulant - that stimulates; "stimulant phenomena"

3.  stimulating(s = adj.all) exhilarating - making lively and cheerful; "the exhilarating effect of mountain air"