Etymology
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overmuch (adj.)

"too great in amount, excessive, immoderate," c. 1300, from over- + much (q.v.). As an adverb, "excessively, immoderately," from late 14c. As a noun, "an excessive amount," c. 1300. Old English had cognate ofermicel. Middle English had also overmore "further, in addition, moreover" (late 14c.). 

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Definitions of overmuch
1
overmuch (n.)
a quantity that is more than what is appropriate;
Synonyms: overabundance / overmuchness / superabundance
2
overmuch (adv.)
more than necessary;
let's not blame them overmuch
Synonyms: too much
3
overmuch (adj.)
very great in quantity; overabundant;
showed overmuch affection
From wordnet.princeton.edu