What is the euphemism treadmill?
The euphemism treadmill is the observation that a polite substitute for an uncomfortable word eventually acquires the negative connotations of the word it replaced, prompting a new substitute, and so on indefinitely.
The term was coined by Steven Pinker, and the phenomenon is well documented.
Examples of the cycle:
Terms for the lavatory have rotated through privy, water closet, toilet, bathroom, restroom, washroom — most originally meaning something else entirely and adopted precisely because they were indirect.
Terms for poverty: poor, then needy, deprived, disadvantaged, underprivileged, low income.
Terms for the elderly, for disability, and for many medical and psychiatric conditions have followed the same pattern, sometimes several times within a century.
Why it happens. The unease attaches to the concept, not the word. A word is a label; if the underlying thing carries stigma, whatever label is attached will absorb that stigma through use. Changing the label buys time — the new word has no accumulated associations — but the associations rebuild, because the attitudes that produced them have not changed.
Pinker's summary is that the euphemism treadmill demonstrates that concepts drive meaning rather than the reverse.
What this does and does not imply. It is sometimes used to argue that changing terminology is pointless. That does not follow, and the evidence is more nuanced:
Some replacements are genuinely durable, particularly where they were requested by the group described and reflect a real conceptual shift rather than only a lexical one.
New terms can be more accurate, not merely more polite — replacing a term that conflated distinct conditions, for instance.
Language change accompanies attitude change even if it does not cause it, and refusing to update terminology communicates something regardless.
Dysphemism is the opposite process — deliberately harsher substitution.