mod. indecisive; insipid; weak. : Don't be such a wishy-washy wimp.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
wishy-washy
1693, "feeble or poor in quality," reduplication of washy "thin, watery" (see wash). Meaning "vacillating" first recorded 1873.