• WordNet 3.6
    • v overrefine refine too much or with excess of subtlety "He is overrefining this matter"
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Webster's Revised Unabridged Dictionary
    • v. t Overrefine To refine too much.
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Century Dictionary and Cyclopedia
    • overrefine To refine too much; refine with an undue amount of subtlety.
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Chambers's Twentieth Century Dictionary
    • v.i Overrefine ō-vėr-rē-fīn′ to refine too much
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In literature:

OVERREFINE'MENT, any over subtle or affected refinement.
"Chambers's Twentieth Century Dictionary (part 3 of 4: N-R)" by Various