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Obviosity is when someone tries to trick you or lie to your face, but it's so obvious it's like they're trying to fail on purpose.
You told your mom you finished your homework. She looked at your empty desk and said, 'Are you serious?'
Your friend said he didn't eat the last slice of pizza. It was in his hands, and he was licking it.
Your crush said they didn't notice you. They were staring at you the whole time.