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REFERENCE

really

adv. · interj.
US //ˈɹiɫi// UK //ɹˈiəli// re·al·ly
  1. 1 very (adv.)
    A1 Beginner

    you use this to make an adjective or another adverb stronger.

    an intensifier used to increase the degree of an adjective or adverb.

    Example

    I am really tired after working in the garden all afternoon.

    Example

    The results of the preliminary study were really encouraging, suggesting that the new treatment might be more effective than previously thought.
    Pitfall
    The movie was real good.
    The movie was really good.

    In formal writing, use the adverb 'really' to modify an adjective, not the adjective 'real'.

  2. 2 actually or in fact (adv.)
    A2 Elementary

    used to say that something is true or real, especially when people might doubt it.

    used to emphasize the truth or reality of a statement, often in contrast to what is expected.

    Example

    Do you really think we can finish the project by tomorrow?

    Example

    While the plan sounds good on paper, we need to consider whether it is really feasible given our current budget constraints.
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  1. 3 showing annoyance (interj.)
    B2 Upper Intermediate Informal

    used to show that you are annoyed or think someone is being silly.

    used as an expression of mild displeasure, impatience, or disbelief at another person's behavior.

    Example

    Really, Tom? You are going to wear that old shirt to the wedding?

    Example

    Really, if they expect us to work through the weekend without extra pay, they are going to face a lot of complaints from the staff.
Etymology 1

From Middle English really, realy, rialliche, equivalent to real + -ly.

Etymology 2

From re- + ally.

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