Synonyms of lightheartedness

1 Syllable
mirth, cheers, cheer
2 Syllables
joyousness, gaieties, gaiety, buoyancy
3 Syllables
euphoria, mirthfulness, joyfulness, levities, levity, jauntiness, happiness, sprightliness, waggishness, merriness, blitheness
4 Syllables
nonchalance, spiritedness, facetiousness, jocoseness, carefreeness, frivolity, merry-making, ebullience, joviality, sportiveness, jocundity, lightsomeness, gladsomeness
5 Syllables
jocularity, blithesomeness