First theorized by Japanese roboticist Masahiro Mori in 1970, the Uncanny Valley basically states that the closer a robot or other nonhuman entity gets to resembling a human, the more humans will like and empathize with it.

However, there is a point in development where humans instead become strongly repulsed by the barely-human robot/entity. Fortunately, this effect fades as the robot/entity becomes less distinguishable from a human.

Although hotly debated, the theory is present in many sci-fi movies and the like, and has been used to explain people's reactions to some computer generated characters.
I can't get into "Rumble Roses" because the girls just don't look quite right to me. I guess it's the Uncanny Valley at work.
by Civan August 05, 2006
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The unnaturally wide gap between breasts
"enhanced" with artificial implants.
Natural cleavage is more attractive than
a noticeable uncanny valley.
by Whoppit November 28, 2010
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Like the uncanny valley, but regarding transgender people. Instead of the resulting eeriness being caused by the imperfect resemblance of a human-mimicking replica, in this case the same or similar uneasiness stems from the major or minor ways in which a trans person does not pass as their preferred sex.
Wow, Janet Mockery passes really well, visually, but I can't get over the gay guy voice. The mixture of the two is giving me a serious case of the uncanny tranny valley effect. It's mildly unsettling.
by FreeAssange July 15, 2021
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