The definition of alleged is some claim or something of which you should be wary and unconvinced.(adjective)
An example of something that is alleged is a new drug that is advertised to help lose weight instantly.
The definition of alleged is something that has been stated but not necessarily confirmed.(adjective)
An example of someone who is alleged is person who has been arrested for a crime who has not yet been through the process of trial.
See alleged in Webster's New World College Dictionary
See alleged in American Heritage Dictionary 4
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