adverb
sweepingly; unconditionally; as a rule
Used almost exclusively in negative contexts (一概に～ない) to mean 'cannot be generalized' or 'not necessarily'. It warns against making a blanket statement.
一概に悪いとは言えない。
You can't say it's unconditionally bad.
値段が高いからと
Just because it's expensive doesn't necessarily mean the quality is good.