Meaning of “lightly” - Learner’s Dictionary

lightly

adverb uk us /ˈlaɪtli/
GENTLY

B1 gently:

He kissed her lightly on the cheek.
NOT MUCH

not much:

not do sth lightly

to think carefully about something before you do it, knowing that it is serious:

It's not a decision that I take lightly.
get off lightly ( also UK escape lightly)

to have less trouble or punishment than you expected

(Definition of “lightly” from the Cambridge Learner’s Dictionary © Cambridge University Press)