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In some senses, one-dimensional is marked as figuratively. Watch for register when choosing this word.
one-dimensional
adj 3
Definitions
adj
1
Having length, but no width, height or depth.
A straight line is one-dimensional.
2
Lacking depth or believability; flat.
one-dimensional characters
Such one-dimensional characters have always existed in the theatre along with more recognizably human characters.
3
Lacking personal depth and substance; conceited, vain, shallow, superficial.
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