[Tex/LaTex] Disallow hyphenated words go into the margin in section heading

Question

I had a long section heading that the last word will hyphenate at the end,
which goes into the margin.

Minimal working example:

\documentclass{article}
\usepackage[english]{babel}
\usepackage{blindtext}
\begin{document}
\subsection{longlonglong wordswordswordwords that will cause problem}
\blindtext
\end{document}

produces:

MWE output

I don't want the problem be hyphenated and want it to break line before the last word.
I tried three ways:

1. Manullly add \\. This produces the desired output but it's dirty and bad:
   the pdf bookmark do not recognize \\, the heading may fit into TOC but it just breaks, I may want to switch to double column or other document class.

2. I tried the solutions in this question. That is, using nohyphens provided by hyphenat package, but things gets worse:

nohyphens example

3. use penalty for hyphen:

   \subsection{
   \begingroup
   \hyphenpenalty 10000
   \exhyphenpenalty 10000
   longlonglong wordswordswordwords that will cause problem
   \endgroup
   }
   

result:

hyphenpenalty example

Yeah it breaks at the last word but the first line becomes right-justified.
I want them to be left-justified (and it should).

Hope some want can show me some workaround. Thanks in advance!

Answer 1

\documentclass{article}
\usepackage[english]{babel}
\usepackage{blindtext}
\begin{document}
\subsection{\sloppy longlonglong wordswordswordwords that will cause problem}
\blindtext
\end{document}