"Enthused" vs. "enthusiastic" [closed]

Is it grammatically correct to say "I was enthused" rather than "I was enthusiastic"?

If so, what is the difference between the two?

Solution 1:

The answer is one of preference, not grammar.

Enthused is a back-formation. Because it's newer, some people may be more used to hearing enthusiastic. Also, as the quote below indicates, the two words can have different implications.

Quoth the grammarist:

... problems arise when enthused is used as a past-participle adjective in place of enthusiastic, which is a perfectly good, and far older, word. Plus, the adjective enthused can carry an ironic tone and is difficult to use in earnest.