This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Simple past tense and past participle of protend.

"I hope it all gets loose in the next episode, I think Serena walked in on something like really bad or something - cus like you heard her say "You protended to be the little innocent girl who walked in..." and then Serena talks over her."

portended