Crisp - like a dry twig snapping.
Don't forget "gritty", the random increase /decrease in force to move the trigger. You don't want that, you want either a nice smooth steady build of force -- then a sudden total release as the gun fires. Or a light even take up as the trigger moves, then a sharp increase in force with little to no motion -- then a sudden total release as the gun fires.
If you can imagine a glass rod about the diameter of a pencil lead behind the trigger blocking it and a light spring holding the trigger forward. Pulling that trigger would give a light smooth pull until the rod is met. The force would increase with very little rear motion until the glass shatters allowing the trigger to move backward a short distance with little force. That would be "crisp".
Many polymer pistols seem to have a slowly increasing force with gritty feel over a long distance until the slow release as the gun fires and the force on the trigger stays about the same. That's "mushy", "gritty" and "indistinct", none of which are wanted. At least IMHO