An alert and energetic person.
synonyms: eager beaver, live wire, sharpie, sharpy.
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.].
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Polish: pracuś