The difference between Reliable and Sure
When used as adjectives, reliable means suitable or fit to be relied on, whereas sure means physically secure and certain, non-failing, reliable.
Reliable is also noun with the meaning: something or someone reliable or dependable.
Sure is also interjection with the meaning: yes.
Sure is also adverb with the meaning: without doubt, certainly.
check bellow for the other definitions of Reliable and Sure
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Reliable as an adjective:
Suitable or fit to be relied on; worthy of dependence or reliance; trustworthy
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Reliable as an adjective (signal processing, of a [[communication]] [[protocol]]):
Such that either a sent packet will reach its destination, even if it requires retransmission, or the sender will be told that it didn't
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Reliable as a noun:
Something or someone reliable or dependable
Examples:
"the old reliables"
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Sure as an adjective:
Physically secure and certain, non-failing, reliable.
Examples:
"This investment is a sure thing. The bailiff had a sure grip on the prisoner's arm."
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Sure as an adjective:
Certain in one's knowledge or belief.
Examples:
"He was sure she was lying. I am sure of my eventual death. John was acting sure of himself but in truth had doubts."
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Sure as an adjective:
Certain to act or be a specified way.
Examples:
"Be sure to lock the door when you leave."
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Sure as an adjective (obsolete):
Free from danger; safe; secure.
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Sure as an adjective (obsolete):
Betrothed; engaged to marry.
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Sure as an adverb (modal adverb):
Without doubt, certainly.
Examples:
"Sure he's coming! Why wouldn't he?"
"Did you kill that bear yourself? ―"I sure did!"