acting or done without careful consideration of the possible consequences; impetuous

it would be extremely rash to make such an assumption

a rash decision

an area of redness and spots on a person's skin, appearing especially as a result of allergy or illness

a red itchy rash appeared on her legs

next day he broke out in a rash

a series of things of the same type, especially when unwelcome, happening within a short space of time

a rash of strikes by health workers