Malfunctioning rhymes with:
functioning, functioning, functioning, sanctioning, auctioning, functioning, sanctioning, sectioning, airconditioning, apportioning, auctioning, auditioning, captioning, cautioning, commissioning, conditioning, cushioning, decommissioning, fashioning, freshening, functioning, mentioning, motioning, optioning, partitioning, petitioning, positioning, rationing, reconditioning, repositioning, sanctioning, sectioning, stationing, transitioning, vacationing