Here's what rhymes with improtant.
                        
                        
                    
                                potent  Words that almost rhyme with improtant
rodent  cogent  reopened  unopened  moment  noticed  lowest  locust  potest  docent  drollest  pronest  poet  focused  closest  opponent  enrollment  encroachment  quotient  enrolment  focussed  knowest  proponent  remotest  deponent  elopement  grossest  posttest  slowest  doughnut  enthronement  donut  engrossment  poulticed  hostessed  component  atonement  coldest  dethronement  refocused  violist  emblazonment  refocussed  folklorist  immodest  unfocused  unfocussed  wholesomest  honeylocust  postponement  chiropodist  cosmogonist