blithe (adj.)

joyous

felicitate (v.)

to wish joy or happiness to

festal (adj.)

joyous

gladden (v.)

to make glad

gusto (n.)

keen enjoyment

beautitude (n.)

any state of great happiness

beatitude (n.)

any state of great happiness

beatify (v.)

to make supremely happy

benign (adj.)

good and kind of heart

invigorate (v.)

to animate

gaiety (n.)

festivity

elation (n.)

a feeling or state of great joy or pride

serendipity (n.)

good fortune; luck

nostalgia (n.)

A bittersweet longing for things, persons, or situations of the past

jubilant (adj.)

showing great joy, satisfaction, or triumph

exultant (adj.)

joyful and proud especially because of triumph or success

potent (adj.)

powerful; mighty

vivacity (n.)

A lively, emphatic, eager quality or manner

vigor (n.)

energy, liveliness

lively (adj.)

Full of life and energy; vigorous