Yes, yes...the title is a joke, but I can't think of a more accurate description!
I've noticed people truncating phrases such as "he has very little energy" to "he is low energy," or saying "she is low IQ" instead of "she has a low IQ."
How would this phenomenon[?!] be best described from a grammatical standpoint?
/He's low energy. /She's low IQ. )
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This is ellipsis - very frequently encountered in English - omission of words with the meaning understood from the context:
He has very little energy./He's a low energy person./He's low energy. (The words "a" and "person" are omitted for brevity and are understood from the context.)
She has a low IQ./She's a low IQ person./She's low IQ. (The words "a" and "person" are o