gladden

Etymology

glad + -en

verb

1. (transitive) To cause (something) to become more glad.
   A balmy night! and tho' the stars be dim, / Yet let us think upon the vernal showers / That gladden the green earth, and we shall find / A pleasure in the dimness of the stars. 1798, William Wordsworth, The Nightingale
   Her body was bent by age; her limbs trembled with palsy; her face, distorted into a mumbling leer, resembled more the grotesque shaping of some wild pencil, than the work of Nature's hand. Alas! How few of Nature's faces are left alone to gladden us with their beauty! 1838, Charles Dickens, Oliver Twist
2. (intransitive, archaic) To become more glad in one's disposition.