Here's what rhymes with unsentimental.
mental gentle dental rental sentimental lentil fundamental parental incidental judgmental judgemental continental instrumental elemental incremental oriental placental regimental temperamental governmental detrimental monumental ornamental supplemental nonjudgmental environmental experimental developmental accidental coincidental occidental transcontinental compartmental excremental subcontinental transcendental intergovernmental nongovernmental intercontinental Words that almost rhyme with unsentimental
temple tangential semble torrential dissemble inessential influential resemble assemble exponential tremble prudential deferential evidential exemple penitential sentential credential nonessential residential existential preferential sequential referential reverential unessential disassemble presidential circumferential providential reassemble consequential inconsequential metal mettle nettle central essential settle pencil methyl tensile ventral kettle medal rectal septal eventful meddle mesial betel erectile festal kennel petal venial fennel nestle fettle mescal vestal level several potential careful vessel devil differential rebel peril pedal acetyl bevel dimethyl inferential pebble resentful restful revel vengeful wrestle faecal feral imperil pestle sessile beryl peddle prehensile unsettle bedevil bipedal cecal shekel bezel embezzle heckle nonmetal zestful headstall chestful dishevel special helpful dreadful epithelial spectral sterile ancestral endothelial healthful projectile treble uneventful bestial fretful prayerful pubertal quintessential trestle dialectal resettle speckle utensil freckle teakettle treadle gunmetal pretzel departmental especial respectful orchestral stressful neglectful palpebral revengeful unhelpful distressful regretful traversal primaeval unhealthful shovelful successful celestial confidential experiential colorectal forgetful multilevel tocopherol suspenseful overcareful unsuccessful disrespectful interdepartmental cockleshell nondepartmental nonresidential quadrupedal