Just the facts, ma'am.
Unless the gig was very short (and so can be safely omitted), there's no reason to be coy about simply listing, in objective terms, where you worked and what you did. If you like, you can simply go into more detail (lines / bullet points) about the positive experiences, and less detail about the negative ones.
Also, you can safely "couch" negative experiences (like being fired for no particular reason, or effectively forced to quit by some domineering jerk) in various ways, like for example when it comes to listing references -- because it kind of looks bad not to have at least one reference for recent gigs, at least -- to simply not give the phone number of the obtuse junior manager which was the main reason you quit anyway, but listing instead a compatriot developer, perhaps still bound to his desks with golden handcuffs, but who knew the deal about what was going on in that sorry place, and won't be shy about putting a positive spin on your time there.
Basic idea being is that if you must convey negative (or simply lackluster) information about a former employer, it's vastly better to let someone else do it for you.
Or if you must deal the poop yourself, at least try to soft-pedal it so that the basic truth gets across (while still not sounding like you're nursing a grudge): so instead of saying "OMG they were so clueless", true though this may be, you can say things like "well they weren't really interested in trying new ways of doing things, so ultimately I felt my talents were underutilized."