WordNet sense 1 (characterized by a lightly pert and exuberant quality):

irreverent, saucy

WordNet sense 2 (displaying animation, vigor, or liveliness):

spirited

WordNet sense 3 (not pertinent to the matter under consideration):

extraneous, immaterial, orthogonal

WordNet sense 4 (having no bearing on or connection with the subject at issue):

irrelevant

WordNet sense 5 (improperly forward or bold):

fresh, impudent, overbold, sassy, smart, wise

WordNet sense 6 (used of temperament or behavior; lacking restraint or modesty):

forward