The difference between Blah and Bleh
When used as adjectives, blah means dull, whereas bleh means mildly uncomfortable.
Blah is also interjection with the meaning: an expression of mild frustration.
Blah is also noun with the meaning: nonsense.
Blah is also verb with the meaning: to utter idle, meaningless talk.
check bellow for the other definitions of Blah and Bleh
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Blah as a noun (uncountable, informal):
Nonsense; drivel; idle, meaningless talk.
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Blah as a noun (informal):
(in plural, the blahs) A general or ambiguous feeling of discomfort, dissatisfaction, uneasiness, boredom, mild depression, etc.
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Blah as an adjective (informal):
Dull; uninteresting; insipid.
Examples:
"Well, the new restaurant seems nice, but their menu is a little blah."
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Blah as an adjective (informal):
Low in spirit or health; down.
Examples:
"I decided to go exercise rather than sit around all day feeling blah."
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Blah as a verb (intransitive):
To utter idle, meaningless talk.
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Bleh as an adjective (slang):
Mildly uncomfortable; not good.
Examples:
"I'm feeling a bit bleh."