wish ‧ y-wash ‧ y /ˈwɪʃi ˌwɒʃi $ -ˌwɒːʃi, -ˌwɑːʃi/ BrE AmE 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