delightful (adj.)

c. 1200, delit, "high degree of pleasure or satisfaction," also "that which gives great pleasure," from Old French delit "pleasure, delight, sexual desire," from delitier "please greatly, charm," from Latin delectare "to allure, delight, charm, please," frequentative of delicere "entice" (see delicious). Spelled delite until 16c.; the modern unetymological form is by influence of light, flight, etc.

word-forming element attached to nouns (and in modern English to verb stems) and meaning "full of, having, characterized by," also "amount or volume contained" (handful, bellyful); from Old English -full, -ful, which is full (adj.) become a suffix by being coalesced with a preceding noun, but originally a separate word. Cognate with German -voll, Old Norse -fullr, Danish -fuld. Most English -ful adjectives at one time or another had both passive ("full of x") and active ("causing x; full of occasion for x") senses.

It is rare in Old English and Middle English, where full was much more commonly attached at the head of a word (for example Old English fulbrecan "to violate," fulslean "to kill outright," fulripod "mature;" Middle English had ful-comen "attain (a state), realize (a truth)," ful-lasting "durability," ful-thriven "complete, perfect," etc.).