Etymology
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really (adv.)

c. 1400, "actually, in fact, in a real manner," originally in reference to the presence of Christ in the Eucharist, "substantially," from real (adj.) + -ly (2). The general sense is from early 15c. Purely emphatic use dates from c. 1600, "indeed," sometimes as a corroboration, sometimes as an expression of surprise or a term of protest; interrogative use (as in oh, really?) is recorded from 1815.

updated on May 11, 2021

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Definitions of really from WordNet

really (adv.)
in accordance with truth or fact or reality;
they don't really listen to us
Synonyms: truly / genuinely
really (adv.)
in actual fact;
Synonyms: actually
really (adv.)
in fact (used as intensifiers or sentence modifiers);
really, you shouldn't have done it
Synonyms: in truth / truly
really (adv.)
used as intensifiers; `real' is sometimes used informally for `really'; `rattling' is informal;
a really enjoyable evening
Synonyms: very / real / rattling
From wordnet.princeton.edu, not affiliated with etymonline.