A teetotaller is a person who never drinks alcohol. It is the noun that goes with the adjective 'teetotal': 'She's teetotal' and 'She's a teetotaller' say the same thing, and the second is a bit more emphatic, because it makes the not-drinking into an identity rather than a habit. As with teetotal, the meaning is absolute — not 'hardly drinks', but none at all. Spelling: British English writes teetotaller with two l's, American English usually teetotaler with one. Both are correct in their own place; follow whichever spelling system your school uses. The word is somewhat old-fashioned and carries a faint echo of the temperance meetings it was born in, so it can sound slightly stiff or slightly amused depending on who says it — 'my aunt, a lifelong teetotaller' reads a bit affectionately, almost like a character description. A modern speaker describing themselves is far more likely to say 'I don't drink' or 'I'm sober'. And note that 'sober' is not a synonym: sober can mean 'not drunk right now', and it is also the word people in recovery use about themselves; teetotaller is simply a statement of lifelong practice and says nothing about why.

滴酒不沾的人。英式拼 teetotaller（兩個 l），美式常拼 teetotaler。語感偏舊，現代人多半直接說 I don't drink。