intelligent
adjective | in·tel·li·gent
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: having or indicating a high or satisfactory degree of intelligence and mental capacity; especially : having or indicating an understanding of the nature and consequences of an act or decision a knowing and intelligent waiver of counsel — compare knowing : having or indicating an understanding of the nature and consequences of an act or decision a knowing and intelligent waiver of counsel — compare knowing
Note: Under Miranda v. Arizona, 384 U.S. 436 (1966), a waiver of rights must be knowing and intelligent.