[Tex/LaTex] A thicker wave underline

Question

I have found \uwave in the ulem package, and its definition in ulem.sty:

% Now define various special underlines.  All the definitions go like
% \def \command {\bgroup \markoverwith{something} \ULon}

% For drawing a wavey underline instead of a straight one the command
% is \uwave (under-wave) which uses the wiggle from 6-pt lasy font:

\def\uwave{\bgroup \markoverwith{\lower3.5\p@\hbox{\sixly \char58}}\ULon}
\font\sixly=lasy6 % does not re-load if already loaded, so no memory problem.

I would like to keep the underline wave, but much thicker, does anyone know how to do it?

Answer 1

There is a bold variant of the lasy fonts: lasyb10. Some scaling is needed to fit the width of the character of font lasy6 (e.g., because of different design size).

The example is plain TeX syntax, therefore I keep it.

% plain TeX    
\input ulem.sty\relax
\catcode`\@=11 %

\font\uwavefontold=lasy6
\font\uwavefont=lasyb10 scaled 652

\def\uwaveold{%
  \bgroup
    \markoverwith{%
      \lower3.5\p@\hbox{\uwavefontold\char58}%
    }%
  \ULon
}
\def\uwave{%
  \bgroup
    \markoverwith{%
      \lower3.5\p@\hbox{\uwavefont\char58}%
    }%
  \ULon
}

\uwaveold{Hello World}

\uwave{Hello World}

\bye

Compare the result: