Liveliness and eagerness:
— He accepted with alacrity.

synonyms: briskness, smartness.

Roget 602: willingness, voluntariness etc. adj.^†; willing mind, heart.    disposition, inclination, leaning, animus; frame of mind, humor, mood, vein; bent etc. (turn of mind) 820; penchant etc. (desire) 865; aptitude etc. 698.    docility, docibleness^†; persuasibleness^†, persuasibility^†; pliability etc. (softness) 324.    geniality, cordiality; goodwill; alacrity, readiness, earnestness, forwardness; eagerness etc. (desire) 865.    asset etc. 488; compliance etc. 762; pleasure etc. (will) 600; gratuitous service.    labor of love; volunteer, volunteering.    ... show more

Roget 682: activity; briskness, liveliness etc. adj.; animation, life, vivacity, spirit, dash, energy; snap, vim.    nimbleness, agility; smartness, quickness etc. adj.; velocity, etc. 274; alacrity, promptitude; despatch, dispatch; expedition; haste etc. 684; punctuality etc. (early) 132.    eagerness, zeal, ardor, perfervidum aingenium [Lat.], empressement [Fr.], earnestness, intentness; abandon; vigor etc. (physical energy) 171; devotion etc. (resolution) 604; exertion etc. 686.    industry, assiduity; assiduousness etc. adj.; sedulity; laboriousness; drudgery etc. (labor) 686; painstaking, diligence; perseverance etc. 604.1; indefatigation^†; habits of business.    vigilance etc. 459; wakefulness; sleeplessness, restlessness; insomnia; pervigilium^†, insomnium^†; racketing.    movement, bustle, stir, fuss, ado, bother, pottering, fidget, fidgetiness; flurry etc. (haste) 684.    officiousness; dabbling, meddling; interference, interposition, intermeddling; tampering with, intrigue.    press of business, no sinecure, plenty to do, many irons in the fire, great doings, busy hum of men, battle of life, thick of the action.    housewife, busy bee; new brooms; sharp fellow, sharp blade; devotee, enthusiast, zealot, meddler, intermeddler, intriguer, busybody, pickthank^†; hummer, hustler, live man [U.S.], rustler [U.S.].    ... show more

Roget 836: cheerfulness etc. adj.; geniality, gayety, l'allegro [Fr.], cheer, good humor, spirits; high spirits, animal spirits, flow of spirits; glee, high glee, light heart; sunshine of the mind, sunshine of the breast; gaiete de coeur [Fr.], bon naturel [Fr.].    liveliness etc. adj.; life, alacrity, vivacity, animation, allegresse^†; jocundity, joviality, jollity; levity; jocularity etc. (wit) 842.    mirth, merriment, hilarity, exhilaration; laughter etc. 838; merrymaking etc. (amusement) 840; heyday, rejoicing etc. 838; marriage bell.    nepenthe, Euphrosyne^†, sweet forgetfulness.    optimism etc. (hopefulness) 858; self complacency; hedonics^†, hedonism.    ... show more

Dutch: vlugheid, hulpvaardigheid, gewilligheid, bereidheid, behulpzaamheid, bereidwilligheid, enthousiasme
Polish: fertyczność