the capacity for vigorous activity; available power

I eat chocolate to get quick energy.

an adequate or abundant amount of such power

I seem to have no energy these days.

Often, energies. a feeling of tension caused or seeming to be caused by an excess of such power

to work off one's energies at tennis.

an exertion of such power

She plays tennis with great energy.

the habit of vigorous activity; vigor as a characteristic

Foreigners both admire and laugh at American energy.

the ability to act, lead others, effect, etc., forcefully.

forcefulness of expression

a writing style abounding with energy.

Physics . the capacity to do work; the property of a system that diminishes when the system does work on any other system, by an amount equal to the work so done; potential energy. Symbol

E

any source of usable power, as fossil fuel, electricity, or solar radiation.

noun

idleness , inactivity , laziness , lethargy , tiredness

noun

activity , animation , application , ardor , birr , dash , drive , effectiveness , efficacy , efficiency , lan , endurance , enterprise , exertion , fire , force , forcefulness , fortitude , get-up-and-go , go , hardihood , initiative , intensity , juice , life , liveliness , might , moxie * , muscle , operativeness , pep , pizzazz , pluck , potency , power , puissance , punch , spirit , spontaneity , stamina , steam , strength , toughness , tuck , vehemence , verve , vim , virility , vitality , vivacity , zeal , zest , zing , zip * , burn , conductivity , current , dynamism , electricity , friction , gravity , heat , horsepower , kilowatts , magnetism , potential , pressure , radioactivity , rays , reaction , response , service , voltage , wattage , sprightliness , athleticism , atomic , bang , brio , cathexis , dynamics , effort , energetics , enthusiasm , fireball , firebrand , fuel , geothermal , gusto , impetus , motivity , numen , quantum , solar , strengtheffectiveness , strenuosity , vigor , zip