one thing; a single matter; often used to emphasize that two situations or topics are identical

two entirely different matters; two unrelated things that should not be confused with each other

To not regard something as a matter of any importance; to treat something as if it does not matter.

to not take as a serious matter; to pay no attention to; to treat with indifference or as being of no importance

to not care about something; to treat something as unimportant or not worth considering

to be not bad at all; to look or sound like the real thing; quite decent

to take something seriously; to treat something with care or conscientiousness; often used in the negative to suggest not worrying about something

to take something seriously; to treat a matter conscientiously or with due importance (often used in negative sentences)

what happened; how did this come about; what is going on

What is the matter?; What is going on?; How did this happen?

the same matter; one and the same thing (often used in the negative to mean two different things)