See anecdotal in Webster's New World College Dictionary
adjective
of or like an anecdote
full of anecdotes
based on personal experience or reported observations unverified by controlled experiments: anecdotal evidence
See anecdotal in American Heritage Dictionary 4
(ănˌĭk-dōtˈl)
adjective
also an·ec·dot·ic(-dŏtˈĭk) or an·ec·dot·i·cal(-ĭ-kəl) Of, characterized by, or full of anecdotes.
Based on casual observations or indications rather than rigorous or scientific analysis: “There are anecdotal reports of children poisoned by hot dogs roasted over a fire of the [oleander] stems”(C. Claiborne Ray).