Antonyms for Quantitative (opposite meaning)
WordNet sense 1 ((of verse) having a metric system based on stress rather than syllables or quantity):
accentualWordNet sense 2 ((of verse) having lines based on number of syllables rather than on rhythmical arrangement of stresses or quantities):
syllabicWordNet sense 3 (involving distinctions based on qualities):
qualitativeFrom the ODE community, based on WordNetadd/edit