Common words that rhyme with insignificant include significant, cant, scant, penchant, brilliant, indignant, unimportant, pleasant, slant, unpleasant, valiant, radiant, fulgurant, vibrant and buoyant.
A significant difference is evident.
Her abdication left the throne vacant.
The smell triggered instant disgust.
The court issued a warrant for his absconding.
Everyone praised her brilliant performance.
His opinion seemed completely unimportant to them.