Synonyms for Active:

adj.

active (adjective)
enterprising, eager, stirring, lively, spirited, energetic, sedulous, vivacious, industrious, busy, vibrant, assiduous, moving, about, tireless, sprightly, bustling, dynamic, animated.
athletic (adjective)
powerful.
effective (adjective)
potent.
energetic (adjective)
mighty, forceful, kinetic, fresh, energetic, vigorous, spunky, vivacious, snappy, fervid, effervescent, potent, ardent, driven, peppy, puissant, zippy, mettlesome, powerful, zealous, spirited, strong.
forcible (adjective)
forcible.
hardworking (adjective)
industrious.
having movement (adjective)
flowing, rapid, operative, running, efficacious, bustling, functioning, rushing, effective, moving, alive, operating, going, progressive, working, pushing, astir.
involved with (adjective)
concerned.
lively (adjective)
vital, brisk, vigorous, enthusiastic, mettlesome, alert, lively, animated.
moving (adjective)
going, passing, coursing, stirring, flowing, running, moving, proceeding, transiting.
running (adjective)
running.
sharp (adjective)
sharp.
very involved in activity (adjective)
alert, energetic, chipper, sprightly, sharp, brisk, industrious, aggressive, lively, intense, high-spirited, forceful, agile, nimble, zealous, on the move, dashing, busy, quick, fresh, bold, resolute, dynamic, engaged, enthusiastic, spry, animated, dexterous, eager, frisky, forcible, determined, keen, assiduous, enterprising, eventful, purposeful, daring.
vigorous (adjective)
exuberant, earnest, vigorous, lively, zippy, strenuous, industrious, agitated, ablaze, zealous, zestful, sharp, spirited, afire, passionate, excited, frisky, prolific, animated, powerful, mettlesome, puissant, fiery, strong, emphatic, hearty, enthusiastic, eager, fervent, peppy, full-blooded, energetic, potent, sprightly, burning, lusty, ardent, virile, dynamical, impassioned.

adv

moving (adverb)
astir.

n.

charge, arc, arc light, actual, rushing, serviceable, current, efficacious, working, effective, productive, ac, functioning, brownout, inactive, effectual, operative, quiet, acting, operating, engaged, volatile, ongoing, alternating current, up and around. frenzied, determined, sluggish, eventful, lethargic, lazy, intense, resolute, fresh, keen, vibrant, sharp, aggressive, unwearied, daring, load down, immersed in something, hard at it, dexterous, high-spirited, hectic, knee-deep, frenetic, rushed/run off your feet, rushed, kinetic, dashing, bold, rapid, unfaltering, purposeful, pushing, chipper, forcible. buzz, frenzy, action, Grand Central Station, awareness, madhouse, busy season, hum, peak. driving, concerned, in the process of doing something, submerged, be harnessed to, actively, complicit, serious. modern-day, at this time, immediate, present, prevailing, in progress. erupt, dormant, volcano, lava, volcanic, crater, vent, extinct. alkaloid, anaerobic, aerobic, chemical equation, alkaline, chemical, corrosive, catalytic, concentrated. finite, future, causative, ergative, continuous, imperfect, intransitive, imperative, impersonal. compatible, clickable, asynchronous, case-sensitive, compatibility, backward-compatible, bursty, Antivirus, best-of-breed. active (noun)
combat-ready, on the go, gymnastic, hot, athletic, brisk, practicing, active voice, activist, surface-active, activistic, on the move, proactive, busy, live, dynamical, nimble, bustling, overactive, eruptive, astir, dynamic, erupting, quick, progressive, operational, existing, acrobatic, fighting, alive, going, about, agile, involved, physical, existent, participating, active agent, in full swing, moving, lively, spry, on, open, on-duty, hyperactive, dancing, activated.
substance (noun)
active agent.

Other synonyms:

kinetic, Antivirus, dashing, catalytic, chipper, imperfect, arc light, future, case-sensitive, alkaline, lava, alternating current, high-spirited, volcanic, brownout, corrosive, driving, intransitive, inactive, submerged, asynchronous, backward-compatible, chemical equation, complicit, impersonal, load down, bursty, charge, aerobic, alkaloid, concentrated, best-of-breed, finite, ac, continuous, causative, volcano, ergative, actively, rushed, anaerobic, clickable, imperative. serious, working, arc, chemical, compatible, concerned, compatibility, volatile, vent, erupt, operating. crater, current. operative. efficient
effective.
momentous
eventful.
nimble
nimble.
quick
quick, rapid.
Other relevant words:
dashing, kinetic, agile, sharp, rushing, hectic, active agent, practicing, vibrant, clickable, operational, aerobic, engaged, acrobatic, hot, on-duty, on the go, acting, about, chipper, future, brownout, erupt, rushed, high-spirited, keen, present, case-sensitive, operative, existent, athletic, dexterous, efficacious, open, driving, causative, aggressive, progressive, bold, best-of-breed, fresh, eruptive, actively, serious, ac, dancing, existing, finite, ergative, alkaline, hyperactive, proactive, unwearied, current, resolute, alive, concerned, impersonal, combat-ready, nimble, action, bursty, rapid, purposeful, astir, productive, active voice, dynamical, corrosive, activated, intransitive, fighting, quick, participating, determined, eventful, volcanic, activistic, volcano, activist, charge, alkaloid, working, catalytic, functioning, surface-active, daring, vent, effectual, involved, overactive, intense, complicit, gymnastic, chemical, prevailing, physical, operating, live, on the move, pushing, erupting, spry, effective, forcible, ongoing, backward-compatible, on.

Usage examples for active

  1. My cure had only lasted three weeks, but I was not able to put the hand to any active employment for eighteen months afterwards. – The Memoires of Casanova, Complete The Rare Unabridged London Edition Of 1894, plus An Unpublished Chapter of History, By Arthur Symons by Jacques Casanova de Seingalt
  2. Temple appears to have kept up a very active correspondence with his mistress. – The-Love-Letters-of-Dorothy-Osborne-to-Sir-William-Temple-1652-54 by Osborne, Dorothy