Etymology
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wishy-washy (adj.)

1690s, "feeble or poor in quality," reduplication of washy "thin, watery." Meaning "vacillating" is attested by 1873.

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shilly-shally (v.)
"to vacillate," 1782, from adverbial expression to stand shilly-shally (1703), earlier shill I, shall I (1700), a fanciful reduplication of shall I? (compare wishy-washy, dilly-dally, etc.). From 1734 as an adjective, by 1755 as a noun. Related: Shilly-shallying (1816).
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washy (adj.)
1610s, "over-diluted," from wash (n.) + -y (2). Sense of "feeble, weak" is from 1630s. Related: Washiness.
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