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Tostao's birth name is Eduardo Gonalves de Andrade.
You could say "He smiled cunningly."
"Cunningly" is an adverb. It modifies a verb, adjective, or another adverb, indicating the manner in which something is done.
You do not want to hang out with somebody cunningly on April fools day.
The sly fox cunningly lured the rabbit into his lair.