glad, pleased, rejoice
嬉 centers on a feeling of joyful satisfaction: being glad, pleased, or rejoicing about something good.
嬉 combines 女 (woman) with 喜 (joy), suggesting a woman expressing gladness or pleasure. The exact historical development is uncertain, but the component relationship is straightforward.
A woman (女) with joy (喜) on her face: she is glad and pleased, rejoicing in the moment.
For キ, imagine a woman so glad she can't stop giggling: the key sound of her giggle is 'ki ki ki', tying キ to the joyful scene.
happy; glad; pleased; delighted; overjoyed
merry; joyful; gleeful
weeping for joy; crying with happiness
happy tears; tears of joy
to one's delight; to one's joy
flattery; adulation; commendation
to seem glad; to look happy; to be glad
seeming happy
delightful; glad-looking
(accidentally) peeing out of excitement; excitement urination
frisking; frolicking; romping; merry play
happy laughter
divertimento; divertissement; cassation