Where it’s found: As You Like It, Act II, Scene VII
How it’s used:
JACQUES: Last scene of all,
That ends this strange eventful history,
Is second childishness and mere oblivion,
Sans teeth, sans eyes, sans taste, sans everything.
Where it comes from: This particular monologue is also where English gained the word puking. It’s a favorite of mine, and probably one of Shakespeare’s most famous.
Eventful was definitively a Shakespeare word; there’s no record of it being used other than in As You Like It until it cropped up in the dictionary. It comes from two words (obviously), event and the suffix -ful.
Event meandered its way into English from Middle French and Latin, where the word was eventus. It meant “an occurrence or accident” but also “fortune” and “fate.” It’s a stem of the word evenire, “to come out, happen, or result,” which is also the root of the word venue. [source]
The suffix -ful is, surprisingly or not, derived from the word full. It’s Old English, where it meant “completely, perfect, entire, utter,” and also “full.” It’s Indo-European roots also means the word is related to the word plenary. [source]