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