Open English Wordnet
Adverbs
(r)lightlywithout good reason“one cannot say such things lightly” (r)lightly, lightwith few burdens“experienced travellers travel light” (r)lightlyindulging with temperance“we eat lightly in the morning” (r)lightlywith indifference or without dejection“he took it lightly” (r)thinly, lightlyin a small quantity or extent“spread the margarine thinly over the meat”,
“apply paint lightly” (r)lightlyto a slight degree“her speech is only lightly accented”