Webster's 1828 Dictionary
UNORIGINAL
a. 1. Not original; derived.
2. Having no birth; ungenerated.
New American Oxford Dictionary
unoriginal
un o rig i nal |ˌənəˈrijənl ˌənəˈrɪʤənl | ▶adjective lacking originality; derivative: an uninteresting and unoriginal essay. DERIVATIVES un o rig i nal i ty |-ˌrijəˈnalətē |noun, un o rig i nal ly adverb
Oxford Dictionary
unoriginal
un |ori ¦gin ¦al |ʌnəˈrɪdʒɪn (ə )l | ▶adjective lacking originality; derivative: an uninteresting and unoriginal essay. DERIVATIVES unoriginality |-ˈnalɪti |noun, unoriginally adverb
American Oxford Thesaurus
unoriginal
unoriginal adjective the characters were somewhat interesting, but the story itself was unoriginal: conventional, uninspired, overdone, tired, clichéd, hackneyed; recycled, stock, paint-by-number.
The Wordsmith Dictionary