lightly /ˈlaɪtli/adverb 1forms 4phrases 3 adverb1 •with only a small amount of force or weightAs a teacher, I don't take rudeness in class lightly. formslightlier · more lightly · lightliest · most lightly Phrases with lightly get off lightlyTo end up with a mild punishment, or without serious harm. take lightlyTo treat casually, without seriousness or worry. tread-lightlyCardionema ramosissimum