Wishy-washy

·noun A weak or thin drink or liquor; wish-wash.

II. Wishy-washy ·adj Thin and pale; weak; without strength or substance;

— originally said of liquids. Fig., weak-minded; spiritless.

wishy-washy
Any beverage too weak. Over-watered spirits. "His food the land-crab, lizard, or the frog; His d...

The Sailor's Word-Book
Washy
·adj Watery; damp; soft. II. Washy ·adj Not firm or hardy; liable to sweat profusely with labor; as...

Webster's Dictionary of the English Language
washy
Weak, not firm or hardy.--Webster. Used in New England in various senses. A washy horse is one that ...

Dictionary of American Words And Phrases by John Russell Bartlett.