Words That Rhyme With "Instantaneous" :
3 syllables:
Aeneas, cuneus, Danaus, Junius, Lanius, sanious, splenius
4 syllables:
aeneous, araneose, araneous, Arminius, Arrhenius, arsenious, calcaneus, Comenius, cyaneous, erroneous, euphonious, extraneous, felonious, Flaminius, gramineous, harmonious, idoneous, membraneous, Petronius, Polonius, ruthenious, sanguineous, selenious, symphonious, vimineous
5 syllables:
acrimonious, Aidoneus, antimonious, Apollonius, arcifinious, ceremonious, consanguineous, disharmonious, homogeneous, ignominious, impecunious, inharmonious, miscellaneous, parsimonious, porcellaneous, sanctimonious, unharmonious
6 syllables:
contemporaneous, extemporaneous, inhomogeneous, unceremonious