na-adjective
beyond one's means or position; inappropriate to one's station
Describes behavior, spending, or lifestyle that does not match one's social standing or income. Often used critically.
彼の身分不相応な買い物には驚かされる。
I'm surprised by his purchases that are beyond his means.
身分不相応な生活を続けると、いずれ破綻する。
If you keep living a lifestyle inappropriate to your station, you'll eventually go bankrupt.
Compound of 身分 (social standing) + 不 (not) + 相応 (suitable).