Etymology
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indeed (adv.)

c. 1600, a contraction into one word of the prepositional phrase in dede "in fact, in truth, in reality" (early 14c.), from Old English dæd "a doing, act, action, event" (see deed (n.)). As an interjection, 1590s; as an expression of surprise or disgust, 1834. Emphatic form yes (or no) indeedy attested from 1856, American English.

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Definitions of indeed

indeed (adv.)
in truth (often tends to intensify);
they said the car would break down and indeed it did
it is very cold indeed
indeed, the rain may still come
was indeed grateful
Synonyms: so
indeed (adv.)
(used as an interjection) an expression of surprise or skepticism or irony etc.;
From wordnet.princeton.edu