Here's what rhymes with untrue.
you true blue drew u blew lieu lu rue brew loo pew yew yu ewe ru roux to who do two new through too few view due knew du grew que crew threw coup flew q qu shoe zu clue cue dew glue hue queue shew su sue tu vous chew cu deux flue fu slew zoo bu flu hu ju jus ku mu nu peu piu pu seu shu sou thru vu woo boo chou chu coo cou doo feu fue gu hew mieux shou shrew sprue thu tue tzu vou vue wou wu clew goo imbue mew moo pooh strew poo shoo spew endue fondue gnu indue slue thew whew phew pursue screw anew renew undue accrue debut stew taboo undo adieu ado construe skew tattoo beaucoup outdo askew outgrew redo halloo valuer muumuu booboo achoo into review interview withdrew bamboo canoe ensue subdue jusqu eschew revue shampoo sinew vnto ballyhoo honeydew foreknew zebu kazoo marabou bestrew prevue overdrew wazoo regrew atishoo revenue overview residue avenue rendezvous retinue caribou overdue overthrew kangaroo overdo hullabaloo bugaboo peekaboo buckaroo overflew overshoe superglue overgrew hitherto barbecue cockatoo misconstrue barbeque