different between unrounded vs nonround

English

un- +? rounded

unrounded (comparative more unrounded, superlative most unrounded)

non- +? round

nonround (not comparable)

(of a shape) Not round.
(phonetics, of a vowel) Having qualities the opposite of a round vowel.
(psychology, of a number) Having a sharp or precise numeric value; having not been rounded.
- 2004, Amos Tversky, Preference, Belief, and Similarity [1], page 85:
  a round number (e.g., 100) was paired with a nonround number (e.g., 103).
- 2007 September 21, "Random Samples" in Science 317(5845), page 1657 [2]:
  The researchers hypothesize that everyday experience teaches us that round (imprecise) numbers are usually larger than nonround (sharp) numbers.

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