What is the meaning of lightly?

adverb

• Without good reason.
  • usage: "one cannot say such things lightly"
• With few burdens.
  • usage: "experienced travellers travel light"
  • synonyms: light
• With little weight or force.
  • usage: "she kissed him lightly on the forehead"
  • synonyms: softly, gently
• Indulging with temperance.
  • usage: "we eat lightly in the morning"
• With indifference or without dejection.
  • usage: "he took it lightly"
• In a small quantity or extent.
  • usage: "spread the margarine thinly over the meat"; "apply paint lightly"
  • synonyms: thinly
• To a slight degree.
  • usage: "her speech is only lightly accented"