The difference between Unacceptable and Understandable
When used as adjectives, unacceptable means unsatisfactory, whereas understandable means capable of being understood.
Unacceptable is also noun with the meaning: something that is not acceptable.
check bellow for the other definitions of Unacceptable and Understandable
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Unacceptable as an adjective:
unsatisfactory; not acceptable
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Unacceptable as an adjective (linguistics):
not conforming to accepted usage
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Unacceptable as a noun:
Something that is not acceptable.
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Understandable as an adjective:
Capable of being understood; comprehensible.
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Understandable as an adjective:
Capable of being accepted or excused under the circumstances.