c. 1400, "joyous;" 1520s, "highly pleasing, affording great pleasure or satisfaction," from delight (n.) + -ful. Related: Delightfully; delightfulness.
the comedy was delightful
a delightful surprise
deliciousness
delict
deligate
deligation
delight
delightful
delightsome
Delilah
delimit
delimitation
delimiter