wishy washy
[adjective]
Synonyms: insipid, banal, bland, jejune, milk-and-water, namby-pamby, sapless, vapid, waterish, watery, characterless, pantywaist

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Related Idioms: neither flesh, fowl, nor good red herring, neither one thing nor the other
Related Words: enervated, languid, listless, spiritless, flavorless, savorless

[TahlilGaran] English Synonym Dictionary ▲

wish‧y-wash‧y /ˈwɪʃi ˌwɒʃi $ -ˌwɒːʃi, -ˌwɑːʃi/ adjective informal
[Date: 1600-1700; Origin: washy 'thin, watery' (16-20 centuries), from wash]

1. someone who is wishy-washy does not have firm or clear ideas and seems unable to decide what they want – used to show disapproval:
a bunch of wishy-washy liberals

2. colours that are wishy-washy are pale and unexciting, not strong or dark – used to show disapproval

[TahlilGaran] Dictionary of Contemporary English ▲

wishy-washy
unable to decide, have no definite opinion
He is very wishy-washy and can never make up his mind about what he wants to do.

[TahlilGaran] English Idioms Dictionary ▲