Here's what rhymes with decideable.
decidable Words that almost rhyme with decideable
excitable describable ascribable tripodal indescribable desirable viable sizable sizeable definable liable likable likeable risible liveable deniable reliable advisable undesirable indefinable pliable assignable undefinable survivable undeniable inadvisable libidinal indictable recyclable certifiable notifiable climbable unlikeable unliveable justifiable unreliable verifiable realizable cognizable maniacal analyzable rectifiable identifiable irreconcilable unjustifiable ammoniacal classifiable demoniacal reconcilable unverifiable nonassignable recognizable unidentifiable unrecognizable monomaniacal