The difference between Blah and Bleah
When used as interjections, blah means an expression of mild frustration, whereas bleah means expresses negative feeling. the quality of the emotion expressed is more negative than that of 'blah' and has a slight feeling of disgust, verging on nausea.
Blah is also noun with the meaning: nonsense.
Blah is also verb with the meaning: to utter idle, meaningless talk.
Blah is also adjective with the meaning: dull.
check bellow for the other definitions of Blah and Bleah
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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.