opposite with prefixes
TRANSCRIPT
IRRegular-irregularRelevant-irrelevantRational-irrationalResponsible-irresponsible
UNHappy-unhappyTrue-untrueComfortable-uncomfortable
Necessary-unnecessaryFriendly-unfriendly
INCorrect-incorrect
Decisive-indecisive Appropriate-inappropiate
Curable-incurable Finite-infinite
ILLegal-illegal
Logical-illogicalLiterate-illiterateLegible-illegible
IMPosible-imposible Mature-immature Proper-improper Mortal-immortal Mobile-immobile