Fromover- +‎neat.

overneat (comparativemoreoverneat,superlativemostoverneat)

1. Excessivelyneat.
   • 1714 September 12 (Gregorian calendar), [Joseph Addison;Richard Steeleet al.], “WEDNESDAY, September 1, 1714”, inThe Spectator, number591; republished inAlexander Chalmers, editor,The Spectator; a New Edition, […], volume VI, New York, N.Y.:D[aniel] Appleton & Company,1853,→OCLC:

     A woman who from being a flattern becomesover-neat, or from beingover-neat becomes a flattern, is most certainly in love.

     The spelling has been modernized.

• “overneat”, inWebster’s Revised Unabridged Dictionary, Springfield, Mass.:G. & C. Merriam,1913,→OCLC.

• renovate

• English terms prefixed with over-
• English lemmas
• English adjectives
• English terms with quotations
• English 3-syllable words

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