Hi all, I've just found a little workaround for using boldsymbols. It works even with the nath module. It's probably not the best way of doing it, but since it does the trick for me, I guess it might useful to other ConTeXters. Here it is: \define[1]\boldsymbol{{\hbox{\formula{\bfm #1}}}} I also have to: \definebodyfont [17.3pt,14.4pt,12pt,11pt,10pt,9pt,8pt,7pt,6pt,5pt,4pt] [mm] [mrbf=cmbx10 sa 1, exbf=cmex10 sa 1, mibf=cmmib10 sa 1, sybf=cmbsy10 sa 1, mabf=msam10 sa 1] \setupformulae[method=bold] Then, I may define very handy commands like \define\grad{\boldsymbol{\nabla}} \define[1]\vec{\boldsymbol{#1}} \define[1]\unitvec{\hat{\vec{#1}}} and formulas like this typeset perfectly: \[ \grad h = a \unitvec{n} \]