Related Clues:
- Hard to stir
- Epictetus, for one
- Needing a hint
- Marcus Aurelius was one
- Unemotional sort
- Unwilling to compromise
- With 51-Across, Presley hit with "glue" in the lyrics
- Student of Zeno
- Stiff, inflexible
- Stiff, unbending
- Stiff and inflexible
- Stiff work for the spade back at the end
- One gets stiff in the grid
- Fix it up, so I would, for a big stiff
- It's hard to fit this out before I would