7 letters · 10 points in Scrabble
adjective showing or causing joy and pleasure; especially made happy
adjective eagerly disposed to act or to be of service
adjective feeling happy appreciation
originFrom gladder (“one who makes glad”), or perhaps from Middle English *gladderen, from Old English *gladrian (“to make glad”), equivalent to glad + -er (fequentative suffix).
Etymology from Wiktionary, CC BY-SA 3.0