1) Become glad or happy 2) Chap has to include cheer 3) Cheer 4) Cheer up 5) Elate 6) Hearten 7) Make glad or happy 8) Make happy 9) Make joyful 10) To cause to become more glad 11) To make glad Found on https://www.crosswordclues.com/clue/gladden
Glad'den transitive verb [ imperfect & past participle Gladdened ; present participle & verbal noun Gladdening .] [ See Glad , transitive verb ] To make glad; to cheer; to please; to gratify; to rejoice; to ... Found on http://www.encyclo.co.uk/webster/G/29
Glad'den intransitive verb To be or become glad; to rejoice. « The vast Pacific gladdens with the freight.» Wordsworth. Found on http://www.encyclo.co.uk/webster/G/30