Etymology
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lightly (adv.)

Old English leohtlice "so as not to be heavy" (of material things, but also of sleep, blows, etc.), from light (adj.1) + -ly (2). Similar formation in Old Frisian lichtelik, Old High German lihtlihho, German leichtlich, Old Norse lettlega (see light (adj.1)). Meaning "frivolously, indifferently" is from early 13c. (compare Old English leohtmodnes "frivolity").

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Definitions of lightly

lightly (adv.)
without good reason;
one cannot say such things lightly
lightly (adv.)
with few burdens;
Synonyms: light
lightly (adv.)
with little weight or force;
she kissed him lightly on the forehead
Synonyms: softly / gently
lightly (adv.)
indulging with temperance;
we eat lightly in the morning
lightly (adv.)
with indifference or without dejection;
he took it lightly
lightly (adv.)
in a small quantity or extent;
apply paint lightly
Synonyms: thinly
lightly (adv.)
to a slight degree;
her speech is only lightly accented
From wordnet.princeton.edu