Common words that rhyme with unpleasant include pleasant, conversant, impuissant, instant, significant, brilliant, indignant, insignificant, extant, slant, repentant, gallant, irradiant, flamboyant and exuberant.
The weather is generally quite pleasant.
The smell triggered instant disgust.
A significant difference is evident.
The court issued a warrant for his absconding.
Everyone praised her brilliant performance.
His comment seemed insignificant in the grand scheme.