Incomprehensible rhymes with:
indispensible, indispensible, dulcibelle, impermissible, indispensible, indivisible, irascible, submersible, anibal, berkebile, bonnibel, bonnibelle, contibel, corruptible, dulcibelle, extendible, fungible, hannibal, imperceptible, impermissible, incontrovertible, indelible, indestructible, indispensible, indivisible, interruptible, irascible, nondeductible, submersible, unadjustable, uncollectible