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

  1. Reliable as an adjective:

    Suitable or fit to be relied on; worthy of dependence or reliance; trustworthy

  2. 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

  1. Reliable as a noun:

    Something or someone reliable or dependable

    Examples:

    "the old reliables"

  1. 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."

  2. 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."

  3. Sure as an adjective:

    Certain to act or be a specified way.

    Examples:

    "Be sure to lock the door when you leave."

  4. Sure as an adjective (obsolete):

    Free from danger; safe; secure.

  5. Sure as an adjective (obsolete):

    Betrothed; engaged to marry.

  1. 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!"

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