pulsant
adjective
pul·sant ˈpəl-sənt 
: pulsating with activity
Word History
Etymology
in part borrowed from Latin pulsant-, pulsans, present participle of pulsāre "to strike with repeated blows, beat"; in part from pulse entry 1 + -ant entry 2 — more at pulsate
First Known Use
1709, in the meaning defined above