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Any developmental trajectory that is out of the norm is asynchronous, the delays as much as the precocity. And it explains only part of the gifted experience.
Some may say that in covering the delays and precocity, "asynchronous" encompasses the whole gifted experience.

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"highly intelligent" as a descriptor
While many parents gather on gifted forums to discuss intelligence, some may say that intelligence is only part of the gifted experience, to wit: "highly logical"... illogical behaviour and rule breaking bothers them, even though their impulse control may not enable them to follow the rules as well as they themselves think everyone should..."

Additionally, the term "highly intelligent", like the term "gifted", may inspire some to covet that designation/label.