〜せいで means "because of" with negative connotation — assigns blame for an undesirable outcome.
Blaming cause - It''s because of X that something bad happened
Fault attribution - Due to (someone''s) fault
Because of the rain, the game was cancelled.
Opposite of おかげで (positive cause). Use せいで for blame.
Noun の + せいで
- 雨のせいで (because of rain)
Plain form + せいで
- 寝坊したせいで (because I overslept)
せいで vs おかげで:
- せいで = blame (negative result)
- おかげで = thanks to (positive result)
I was late because of you.
Because I caught a cold, I couldn't go on the trip.
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