overearnest

/ˌoʊvərˈɜːrnɪst/
adjective
  1. Too serious or sincere, often in a way that seems forced or unnatural.
    • His overearnest apology made everyone feel awkward rather than reassured.
    • The actor's overearnest performance was criticized for lacking subtlety.
    • She gave an overearnest nod, trying too hard to show she understood.
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