Here's what rhymes with unrecognised.

Consider these alternatives

unnoted / noted unappreciated / dated unrecorded / accorded hitherto / to unrewarded / rewarded unheeded / conceded undiscovered / covered undetected / rejected unobserved / first unpublicized / muchpublicized heretofore / for unreported / imported volition / position unaddressed / best uncounted / amounted unexecuted / included recognising / leaving unconsidered / considered unpopulated / depopulated