Happiest

adjective

1. Having a feeling arising from a consciousness of well-being or of enjoyment; enjoying good of any kind, such as comfort, peace, or tranquillity; blissful, contented, joyous.

   "Music makes me feel happy."

2. Experiencing the effect of favourable fortune; favored by fortune or luck; fortunate, lucky, propitious.
3. Content, satisfied (with or to do something); having no objection (to something).

   "Are you happy to pay me back by the end of the week?"

4. (Of acts, speech, etc.) Appropriate, apt, felicitous.

   "a happy coincidence"

5. (in combination) Favoring or inclined to use.

   "slaphappy, trigger-happy"