Unfavorable rhymes with:
favorable, favorable, deliverable, discoverable, favorable, maneuverable, recoverable, admirable, adorabelle, answerable, comparable, considerable, deliverable, discoverable, dishonorable, favorable, honorable, imponderable, incomparable, inexorable, innumerable, inoperable, inseparable, insufferable, intolerable, invulnerable, irreparable, maneuverable, measurable, memorable, miserable, operable, pleasurable, preferable, recoverable, tolerable, unalterable, unanswerable, venerable, vulnerable
Unfavorable sounds like:
unbearable, unbearably, unfavorably, unverifiable