I suppose one could just say 'reticent' or just 'shy and reserved.
Some states have substituted a motion to dismiss for failure to state a cause of action for the demurrer.
As you suggest, I would use one or more of the words given in the definition reserved, modest, shy depending on exactly which aspect of demureness I wished to apply to the man.
Those days are over, thank goodness, because demure people are nice and all, but they're also a little boring.
Sleek down to the angled arm, the Demure Simplicity Sconce displays a minimal trend with a dashing tapered shade.
There can be no demurrer to a demurrer: for a demurrer upon a demurrer, or pleading over when an issue in fact is offered, is a discontinuance.