Difference between Sure and Really

SURE vs REALLY: ADJECTIVE

Confident, as of something awaited or expected.
Impossible to doubt or dispute; certain.
Bound to come about or happen; inevitable.
Having one's course directed; destined or bound.
Physically secure or dependable
Infallible or unfailing
(of persons) worthy of trust or confidence
Exercising or taking care great enough to bring assurance
Having or feeling no doubt or uncertainty; confident and assured
Certain to occur; destined or inevitable
Capable of being depended on
Certain not to miss, slip, or err; steady.
Free from harm or danger; safe.
Not hesitating or wavering; firm.
Worthy of being trusted or depended on; reliable.
Free from or marked by freedom from doubt.
Careful to do something.
Impossible to doubt or dispute
Reliable in operation or effect
Certain to act or be a specified way.
Certain in one's knowledge or belief.
Physically secure and certain, non-failing, reliable.
To betroth.
Certainly; without doubt; as, Shall you do? To be sure I shall.
Free from danger; safe; secure.
Betrothed; engaged to marry.
Fit or worthy to be depended on; certain not to fail or disappoint expectation; unfailing; strong; permanent; enduring.
Certain to find or retain.
Certainly knowing and believing; confident beyond doubt; implicity trusting; unquestioning; positive.
Certain not to fail

Very (modifying an adjective); very much (modifying a verb).
Actually; in fact; in reality.
In a real manner; with or in reality; actually; in truth.
Royally.
Without a doubt; indeed.
Very; utterly.
In accordance with truth or fact or reality
To a great degree; very much.
In actual truth or fact.
In actual fact
In fact (used as intensifiers or sentence modifiers)
Used as intensifiers; `real' is sometimes used informally for `really'; `rattling' is informal

Used to express surprise, skepticism, displeasure, or interest.
Indicating surprise at, or requesting confirmation of, some new information; to express skepticism.
Indicating that what was just said was obvious and unnecessary; contrived incredulity
Indicating affirmation, agreement.
Indicating displeasure at another person's behaviour or statement.

Destined or inevitable
Certain to occur
Confident and assured
Certainly; without doubt; doubtless; surely.
Firmly; securely.
Confident; undoubting; having no fear of being deceived or disappointed.
Certain of one's facts, position, or the like; fully persuaded; positive.
Fit or worthy to be depended on; capable of producing a desired effect or of fulfilling requisite conditions; certain not to disappoint expectation; not liable to failure, loss, or change; unfailing; firm; stable; steady; secure; infallible.
Certain to be or happen; certain.
Undoubted; genuine; true.
Out of danger; secure; safe.
Engaged to marry; betrothed.
See to be sure, below.
To make fast by betrothal; betroth.
Synonyms and Certain, Positive, etc. See confident.
Certain to find or retain: with of: as, to be sure of success; to be sure of life or health.
To assure; make certain.
(idiom) (for sure) Certainly; unquestionably.
(idiom) (make sure) To establish something without doubt; make certain.
(idiom) (sure enough) As one might have expected; certainly.
(idiom) (to be sure) Indeed; certainly.

Royally; in a royal or regal manner; like a king.
`real' is sometimes used informally for `really'
Used as intensifiers
Used to give emphasis
`rattling' is informal
Synonyms Truly, absolutely, certainly, verily, positively.
Indeed; to tell the truth; as a fact: often used as a slight corroboration of an opinion or declaration, or interrogatively or exclamatorily to express slight surprise.
In a real manner; with or in reality; in fact, and not in appearance only; in truth; actually; truly.
To form or arrange again; recompose.

Destined, Positive, Reliable, Dependable, Trusted, Bound, Trustworthy, True, Secure, Certain, Surely, Careful, Confident, Certainly, Convinced

Frankly, Yeah, Certainly, Just, Pretty, Definitely, Obviously, In truth, Forsooth, Rattling, Real, Genuinely, Truly, Actually, Very

Destined, Positive, Reliable, Dependable, Trusted, Bound, Trustworthy, True, Secure, Certain, Surely, Careful, Confident, Certainly, Convinced

Frankly, Yeah, Certainly, Just, Pretty, Definitely, Obviously, In truth, Forsooth, Rattling, Real, Genuinely, Truly, Actually, Very

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If it was for something I really really wanted at launch, I would cry.
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Lewis hit the ball really, really hard last year.