Making a rash decision without thinking can lead to problems.

Characterized by a lack of careful consideration of possible consequences; impulsive or hasty.
Don't be rash.
It was a rash choice.
His rash actions caused trouble.
rash act
rash decision
rash judgment
impulsive
hasty
reckless
The baby developed a rash after eating strawberries.

a skin condition characterized by red, inflamed areas often accompanied by itching or discomfort.
He has a red rash.
The rash itched terribly.
She got a rash on her arm.
skin rash
allergic rash
heat rash
eruption
hives
blotch
The sudden rash of burglaries worried the neighborhood.

a sudden outbreak or increase in something, often referring to a series of events or actions that are done hastily.
A rash of complaints followed the decision.
We saw a rash of new stores open.
The rash of fires was concerning.
a rash of
sudden rash of
rash of activity
outbreak
spate
wave