In the collective marks section on a dressage test, this term refers to only the purity and soundness of the gaits. This term has nothing to do with the right or wrong tempo. Often the physical and mental states go hand in hand. This term refers to physical opposition by the horse against the rider. This resistance can be momentary or continuous.
Evasion is a calm but definate desire to avoid what is asked.
Resistant is the horse doing the task put, for instance, pulling on the rider, going sideways, etc. The sequence of footfalls of a given gait. The perfection of this term would be a pure walk, trot or canter. This term is only in reference to the canter. This motion is usually seen when the horse is not covering enough ground, is not correctly engaged or is receiveing interference from the rider.