The difference between Blah and Rubbish
When used as nouns, blah means nonsense, whereas rubbish means garbage, junk, refuse, trash, waste.
When used as verbs, blah means to utter idle, meaningless talk, whereas rubbish means to criticize, to denigrate, to denounce, to disparage.
When used as adjectives, blah means dull, whereas rubbish means exceedingly bad.
Blah is also interjection with the meaning: an expression of mild frustration.
check bellow for the other definitions of Blah and Rubbish
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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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Rubbish as a noun (chiefly, Australia, New Zealand, Britain):
Garbage, junk, refuse, trash, waste.
Examples:
"The rubbish is collected every Thursday in Gloucester, but on Wednesdays in Cheltenham."
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Rubbish as a noun (chiefly, Australia, New Zealand, Britain):
Items of low quality.
Examples:
"Much of what they sell is rubbish."
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Rubbish as a noun (chiefly, Australia, New Zealand, Britain):
Nonsense.
Examples:
"Everything the teacher said during that lesson was rubbish. How can she possibly think that a [[bass viol]] and a [[cello]] are the same thing?"
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Rubbish as a noun (archaic):
Debris or ruins of buildings.
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Rubbish as an adjective (chiefly, Australia, New Zealand, Britain, colloquial):
Exceedingly bad; awful.
Examples:
"synonyms abysmacrappy horrendous shitty terrible; ''see also'' [[Thesaurus:bad]], [[Thesaurus:low-quality]]"
"This has been a rubbish day, and it’s about to get worse: my mother-in-law is coming to stay."
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Rubbish as a verb (transitive, chiefly, Australia, New Zealand, Britain, colloquial):
To criticize, to denigrate, to denounce, to disparage.