The difference between Puffed up and Vain
When used as adjectives, puffed up means proud, whereas vain means overly proud of oneself, especially concerning appearance.
check bellow for the other definitions of Puffed up and Vain
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Puffed up as an adjective:
proud
Examples:
"Since he was elected school prefect, he's become really puffed up."
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Puffed up as a verb:
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Vain as an adjective:
Overly proud of oneself, especially concerning appearance; having a high opinion of one's own accomplishments with slight reason.
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Vain as an adjective:
Having no real substance, value, or importance; empty; void; worthless; unsatisfying.
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Vain as an adjective:
Effecting no purpose; pointless, futile.
Examples:
"'vain toil;  a vain attempt"
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Vain as an adjective:
Showy; ostentatious.