He declined the party invitation because he comes from a super-religious family that doesn't celebrate secular holidays.

super-religious 是由前缀 super-（表示"超级、极度"）和形容词 religious（"宗教的、虔诚的"）组成的复合形容词。 religious 来自名词 religion（宗教），后缀 -ious 表示"具有...性质的"。 super-religious 整体意思是"极度虔诚的"，形容对宗教信仰特别严格和重视的家庭。