Here's what rhymes with unintentionally.
intentionally conventionally unconventionally Words that almost rhyme with unintentionally
genitally definitely exceptionally genuinely indefinitely plentifully sensually tenuously unexceptionally obsessionally eventually delicacy affectionately delicately professionally gentlemanly congenitally perilously intelligibly textually sensuously impenetrably unintelligibly bidirectionally maritally objectionably unexceptionably inevitably celibacy sedulously telegraphy negligibly petulantly questionably technocracy desultorily inequitably resonantly venomously garrulously nebulously unprofessionally decadently decadency presidency unquestionably irrevocably incredulously preeminently relevancy creditably relevantly tremulously querulously credulously expressionlessly benevolently irrelevancy irrelevantly malevolently mellifluously selenography discreditably