The Collaborative International Dictionary
overenthusiasm \overenthusiasm\ n. Excessive enthusiasm.
Wiktionary
n. Excessive enthusiasm.
Usage examples of "overenthusiasm".
Engineers had a tendency to overenthusiasm, especially when it wasn't their butts on the firing line.
In fact, although Bramwell grumbled about juvenile overenthusiasm and addle-headed females in general, Sophie skipped for the entire length of the last block.
If she has a flaw it's overenthusiasm and the tendency to become too personally involved.
Sometimes the Gestapo ran out of patience, and sometimes they killed their subjects by overenthusiasm but, if they were careful and determined, they could make the strongest personality betray his or her dearest comrades.
And NASA's overenthusiasm had, she knew, caused a kind of collective lapse in good political judgement many times before.