hardest to pronounce

[Mullins, Bill]

> >in which case one oft-cited example of the hardest
> monosyllabic word is
> >"sixths" with the final -[ks(th)s] cluster.
>
> My first thought was along those lines; "strengths".
> --
>
For me, "sixths" is harder than "strengths".  I think it's because when you
say "strenghths", the toungue moves along the roof of the mouth from front
to back and then back to front more smoothly than when you say "sixths" (in
which the movement of the toungue is jumpier).