Something anecdotal has to do with anecdotes — little stories. Anecdotal evidence is based on hearsay rather than hard facts.

People like to share stories about things that happened to them, or that they heard about, to make a point. That kind of talk is anecdotal: based on small, personal accounts. Anecdotal stories are helpful when you’re trying to give an example of something, but there's a downside to anecdotal information: since it’s not based on facts, you never know if you can totally trust it. So it's best to go beyond the anecdotal and get more solid information.

Definitions of anecdotal

adj having the character of an anecdote

anecdotal evidence”

adj characterized by or given to telling anecdotes

anecdotal conversation”
“an anecdotal history of jazz”
anecdotic, anecdotical
communicative, communicatory
able or tending to communicate

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