over-enthusiasticallyadv.
/ˌəʊv(ə)rᵻnˌθjuːzɪˈastᵻkli/, /ˌəʊv(ə)rɛnˌθjuːzɪˈastᵻkli/, U.S. /ˈˌoʊvərənˌθ(j)uziˈæstək(ə)li/ Too enthusiastically; with more enthusiasm than is or seems justified.
ΚΠ
1876 M. M. Mason Mae Madden 85 They tossed confetti down on every one's heads—a little over-enthusiastically, but one can pardon even gush if it is only genuine.
1910 Mod. Lang. Notes 25 121/1 He leads everything back somewhat over-enthusiastically to his theory.
1958 R. R. Platt & M. B. Hefny Egypt 8 Professor Breasted likened him [sc. Thutmose III] to Alexander or Napoleon, perhaps overenthusiastically.
2002 Express (Nexis) 22 July 63 He was..cautioned for over-enthusiastically celebrating his goal.
This is a new entry (OED Third Edition, December 2004; most recently modified version published online March 2022).
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adv.1876