Antonyms for sadden

emotion:

gladden.

upset, depress:

assist, encourage, inspirit, make happy, delight, cheer, aid, help, gladden, hearten.

noun:

soothe, comfort, joy, boost, excite, reassure, solace, stimulate, lift, uplift, gratify, lighten, invigorate, rejoice, please, delight, animate, enliven, assure, cheer.