Here's what rhymes with semieffective.
effective defective affective elective ineffective infective invective respective selective corrective detective directive reflective deflective noneffective collective objective perspective subjective connective irrespective convective protective prospective introspective projective retrospective intersubjective nonobjective Words that almost rhyme with semieffective
festive incentive receptive deceptive inventive restive excessive offensive defensive attentive preventive perceptive pensive inattentive imperceptive unoffensive extensive expensive intensive suggestive digestive inexpensive obsessive possessive recessive reflexive inoffensive redemptive retentive disincentive unperceptive aggressive impressive successive expressive depressive oppressive apprehensive congestive preemptive suppressive inexpressive overattentive compressive contraceptive hypertensive repressive regressive hypotensive unimpressive digressive comprehensive progressive coextensive counteroffensive overaggressive nonsuccessive proprioceptive transgressive retrogressive immunosuppressive antihypertensive