‘只不过’ is an adverbial phrase meaning ‘nothing more than’ or ‘merely,’ used to downplay or minimize the significance, size, importance, or extent of something. Literally, 只 means ‘only,’ 不 means ‘not,’ and 过 is a verb meaning ‘to pass’ or ‘to exceed’—so together, the phrase conveys the idea of ‘not even passing (beyond)’ something, i.e., staying strictly within a modest limit.

It often appears before nouns, verbs, or adjective phrases to soften statements, express humility, or contrast expectations with reality. It’s common in spoken and written Mandarin, especially in explanations, apologies, or reassurances. Unlike stronger modifiers like 完全 or 根本, ‘只不过’ carries a gentle, understated tone—never sarcastic or dismissive unless context clearly signals irony.