Here's what rhymes with knowingly.
                        
                        
                    
                                unknowingly  glowingly  Words that almost rhyme with knowingly
jokingly  dotingly  stoically  coaxingly  emotively  gloatingly  imposingly  comity  heroically  ferociously  aerobically  anaerobically  consolingly  roguishly  corrosively  doltishly  devotedly  atrociously  provokingly  revoltingly  explosively