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