Another word that seems to have two meanings is "mean". In the US it seems to mean surly, curmudgeonly and nasty, but in the UK it means parsimonious and tight-fisted.
Which caused some embarrassment when I did a TV interview about the Queen Mother for a US station and described the old trout as mean (UK meaning) and the interviewer assumed I meant the US meaning and took the interview off an another tack entirely.
Mind you, maybe it wasn't too wide of the mark...
...ducks to avoid stoning by rabid royalists...