pertaining to, resembling, or containing anecdotes

an anecdotal history of jazz.

(of the treatment of subject matter in representational art) pertaining to the relationship of figures or to the arrangement of elements in a scene so as to emphasize the story content of a subject. Compare narrative ( def. 6 ) .

based on personal observation, case study reports, or random investigations rather than systematic scientific evaluation

anecdotal evidence.

adjective

scientific

adjective

based on hearsay , unreliable , unscientific