The difference between Eager and Keen
When used as nouns, eager means (tidal bore), whereas keen means a prolonged wail for a deceased person.
When used as adjectives, eager means sharp, whereas keen means often with a prepositional phrase, or with and an infinitive: showing a quick and ardent responsiveness or willingness.
Keen is also verb with the meaning: to make cold, to sharpen.
check bellow for the other definitions of Eager and Keen
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Eager as an adjective (obsolete):
Sharp; sour; acid.
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Eager as an adjective (obsolete):
Sharp; keen; bitter; severe.
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Eager as an adjective:
Desirous; keen to do or obtain something.
Examples:
"The hounds were eager in the chase."
"I was eager to show my teacher how much I'd learned over the holidays."
"You stayed up all night to get to the front of the queue. You must be very eager to get tickets."
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Eager as an adjective:
Brittle; inflexible; not ductile.
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Eager as an adjective (comptheory):
Not employing lazy evaluation; calculating results immediately, rather than deferring calculation until they are required.
Examples:
"an eager algorithm"
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Eager as a noun:
(tidal bore).
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Keen as an adjective:
Often with a prepositional phrase, or with and an infinitive: showing a quick and ardent responsiveness or willingness; eager, enthusiastic, interested.
Examples:
"I’m keen about computers."
"I’m [[keen on keen on]] you. I like you. inline=1"
"He is keen for help."
"She’s keen to learn another language."
"“Do you want to go on holiday with me?” / “Yes, I’m keen.”"
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Keen as an adjective:
Fierce, intense, vehement.
Examples:
"This boy has a keen appetite."
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Keen as an adjective:
Having a fine edge or point; sharp.
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Keen as an adjective:
Acute of mind, having or expressing mental acuteness; penetrating, sharp.
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Keen as an adjective:
Acrimonious, bitter, piercing.
Examples:
"'keen satire or sarcasm"
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Keen as an adjective:
Of cold, wind, etc.: cutting, penetrating, piercing, sharp.
Examples:
"a keen wind"
"the cold is very keen'"
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Keen as an adjective (Britain):
Extremely low as to be competitive.
Examples:
"'keen prices"
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Keen as an adjective (US, informal, dated):
Marvelous.
Examples:
"I just got this peachy keen new dress."
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Keen as an adjective (obsolete):
Brave, courageous; audacious, bold.
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Keen as a verb (transitive, rare):
To make cold, to sharpen.
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Keen as a noun:
A prolonged wail for a deceased person.
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Keen as a verb (intransitive):
To utter a keen.
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Keen as a verb (transitive):
To utter with a loud wailing voice or wordless cry.
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Keen as a verb (transitive):
To mourn.