Definition of milk-and-water in US English:

milk-and-water

adjective

  • attributive Lacking the will or ability to act effectively.

    ‘a milk-and-water rebel’
    • ‘But the best of him testifies both to his unyielding pursuit of perfection in his craft and to a character that was far from being the milk-and-water saint of legend.’
    • ‘On the other hand pious people often have little respect for what they dismiss as milk-and-water values like kindness and compassion.’
    insipid, uninspired, colourless, uninteresting, feeble, flat, dead, dull, boring, tedious, tired, unexciting, uninspiring, unimaginative, lifeless, zestless, spiritless, sterile, anaemic, tame, bloodless, jejune, vacuous, bland, stale, trite, pallid, wishy-washy, watery, tasteless, flavourless
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Pronunciation

milk-and-water

/ˌmilkənˈwädər//ˌmɪlkənˈwɑdər/