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blind as a bat

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*blind as a bat

 

1. completely blind. (Bats are not really blind. *Also: as ~.) He lost his sight in an accident and is as blind as a bat.

2. not able to see well. I'm as blind as a bat without my glasses.

3. unwilling to recognize problems or bad things. Connie is blind as a bat when it comes to her daughter's disgraceful behavior.

See also: bat, blind

blind as a bat

Quite blind; also, unaware. For example, Without my glasses I'm blind as a bat, or I had no idea they wanted me to take over his job; I was blind as a bat. This simile, based on the erroneous idea that the bat's erratic flight means it cannot see properly, has survived even though it is now known that bats have a sophisticated built-in sonar system. [Late 1500s]

See also: bat, blind