Here's what rhymes with idiosyncratic.
erratic static climatic emphatic pneumatic rheumatic chromatic cinematic magmatic theocratic democratic dramatic hepatic aromatic dogmatic pancreatic schematic somatic thematic traumatic autocratic ecstatic enigmatic lymphatic aliphatic asthmatic fanatic kinematic operatic achromatic muriatic phlegmatic acrobatic stigmatic aerobatic automatic systematic aristocratic pragmatic symptomatic charismatic enzymatic prostatic emblematic prismatic idiomatic intrahepatic spermatic technocratic undemocratic zygomatic schismatic astigmatic panchromatic thermostatic undramatic unemphatic diplomatic bureaucratic asymptomatic metastatic axiomatic monochromatic programmatic diagrammatic diaphragmatic homeostatic orthostatic antidemocratic epigrammatic meritocratic nondemocratic numismatic plutocratic nondramatic photostatic problematic electrostatic hydrostatic melodramatic paradigmatic psychosomatic posttraumatic unsystematic semiautomatic undiplomatic homoeostatic unproblematic unidiomatic Words that almost rhyme with idiosyncratic
magic tragic nomadic pelagic syllabic priapic sporadic disyllabic apparatchik monosyllabic polysyllabic classic graphic lactic clastic traffic elastic plastic panic drastic frantic inelastic manic tactic galactic phallic tannic mastic organic romantic fabric gastric metallic semantic ceramic inorganic monastic scholastic thoracic catholic mechanic synaptic climactic galvanic glutamic spastic thalamic aplastic italic viscoelastic oceanographic slapstick neoclassic tyrannic malefic phonographic xerographic dynamic demographic fantastic geographic gigantic psychiatric photographic volcanic barbaric didactic dynastic ethnographic hemorrhagic neoplastic oceanic sarcastic stochastic cephalic geriatric messianic pedantic tympanic gymnastic haemorrhagic heraldic holographic lithographic orthographic satanic thermoplastic titanic tomographic orgiastic stenographic ataxic biographic botanic intergalactic sycophantic matchstick baldric nonelastic seismographic enthusiastic pediatric prophylactic ecclesiastic nostalgic ophthalmic panoramic pornographic presynaptic telegraphic topographic anaphylactic angiographic hyperplastic hypoplastic iconoclastic iconographic psychopathic splanchnic bimetallic bombastic chiropractic isobaric paediatric typographic unromantic calligraphic interscholastic periphrastic cytoplasmic hypothalamic radiographic thermodynamic aerodynamic bibliographic endoplasmic hemodynamic postsynaptic stratigraphic cartographic intrathoracic cinematographic nonmetallic anticlimactic choreographic lexicographic osteopathic chromatographic psychodynamic transatlantic protoplasmic unenthusiastic autobiographic overenthusiastic hydrodynamic crystallographic transoceanic electrocardiographic electroencephalographic