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I would like to put a subscript after a character with multiple underlines in the math mode but ignoring the underlines. How can I do it?

Consider this picture: vertical subscript positions I would like the subscript to have the vertical position of the element with respect to the character. Here is the code the produced the picture:

\documentclass[border=5mm]{standalone}
\usepackage{ulem,amsmath,bm}
\begin{document}
\(C_{\text{c}}, 
\underline{\bm{C}}_{\text{c}}, 
\underline{\underline{\bm{C}}}_{\text{c}}, 
\uuline{\bm{C}}_{\text{c}}\)
\end{document}

Edit: Would be superb if the underline was limited to the width of the character.

honey_badger
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    What about the horizontal position? For the vertical position the easiest thing here is to use an empty group, e.g. \underline{\bm{C}}{}_{\text{c}}. – campa Jul 28 '17 at 15:00
  • Thank you, @campa! I am so stupid :). I updated the post about to reflect on my preference about horizontal position. – honey_badger Jul 28 '17 at 15:04
  • \smash{\underline{\underline{\bm{C}}}}_{\text{c}} as a partially satisfying way –  Jul 28 '17 at 16:15
  • Thanks, @jfbu, but I fail to see how it is different from the empty group solution, proposed above. – honey_badger Jul 28 '17 at 16:24
  • @campa, if adjusting the length of the underline is too much work, could you please submit your comment as an answer? – honey_badger Jul 28 '17 at 16:31

1 Answers1

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Thanks to this answer, the following satisfied my requirements, including additional:

\newcommand{\ubar}[1]{\mkern 1.5mu\underline{\mkern-1.5mu#1\mkern-1.5mu}\mkern 1.5mu}
\newcommand{\uubar}[1]{\ubar{\ubar{#1}}}
honey_badger
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