Here's what rhymes with undecylenic.
phrenic splenic irenic eugenic antigenic pathogenic biogenic pyogenic allergenic schizophrenic transgenic cryogenic iatrogenic neurogenic psychogenic androgenic neurasthenic photogenic telegenic mutagenic teratogenic calisthenic hypoallergenic callisthenic anthropogenic carcinogenic hallucinogenic Words that almost rhyme with undecylenic
pfennig ischemic polemic leukaemic systemic endemic epistemic pandemic totemic academic epidemic nonacademic relic athletic ferric forensic cleric technic allelic benthic steric derrick medic fetich aesthetic poetic authentic acetic metric pathetic pelvic ascetic esthetic phonetic septic centric diuretic hectic peptic emetic eutectic frenetic sceptic skeptic dyslexic geodesic geodetic hermetic antithetic lovesick pectic redbrick bathetic phrenetic dyslectic electric genetic generic kinetic prophetic synthetic anesthetic diabetic dialectic dielectric geometric symmetric angelic antiseptic cosmetic eclectic esoteric numeric anaesthetic apathetic aseptic enteric prosthetic antidiuretic empathetic isomeric tartaric turmeric chimeric dietetic dyspeptic geocentric hysteric acerbic anorectic evangelic homiletic splenetic gametic paregoric unaesthetic unauthentic nonathletic domestic magnetic sympathetic arithmetic atmospheric energetic eccentric majestic asymmetric epileptic alphabetic isometric obstetric cybernetic egocentric monomeric neuroleptic psychedelic anorexic apoplectic inauthentic ionospheric paramedic paraplegic polytechnic pyrotechnic diametric parenthetic exegetic copacetic apologetic concentric mesenteric parametric volumetric phylogenetic psychometric unsympathetic barometric biosynthetic ethnocentric geomagnetic isoelectric kinesthetic ontogenetic photometric heliocentric radiometric antipathetic cataleptic thermometric unapologetic narcoleptic nonelectric unesthetic cliometric photoelectric photosynthetic colorimetric ferromagnetic piezoelectric alphanumeric anthropocentric peripatetic nonmagnetic onomatopoetic telekinetic psychokinetic econometric hydroelectric parasympathetic nonparametric paramagnetic stoichiometric trigonometric pharmacokinetic electromagnetic