Etymology From Middle English indede, univerbation of the phrase in dede (“in sooth, in fact”). Cognate with Saterland Frisian innerdoat, innedoat (“indeed”), West Frisian yndied (“indeed”), Dutch inderdaad (“indeed”), German in der Tat (“indeed”). By surface analysis, in + deed. Compare in fact, in truth, etc. First attested in the early 14ᵗʰ century.
1
Modal Synonym of actually or truly.
Indeed, he made several misplays.
Yes, I do indeed look very similar to you.
4 more examples
Orion hit a rabbit once; but though sore wounded it got to the bury, and, struggling in, the arrow caught the side of the hole and was drawn out. Indeed, a nail filed sharp is not of much avail as an arrowhead; you must have it barbed, and that was a little beyond our skill.1879, R[ichard] J[efferies], chapter II, in The Amateur Poacher, London: Smith, Elder, & Co., […], →OCLC:
I was about to say that I had known the Celebrity from the time that he wore kilts. But I see that I will have to amend that, because he was not a celebrity then, nor, indeed, did he achieve fame until some time after I left New York for the West.1897 December (indicated as 1898), Winston Churchill, chapter I, in The Celebrity: An Episode, New York, N.Y.: The Macmillan Company; London: Macmillan & Co., Ltd., →OCLC:
She was like a Beardsley Salome, he had said. And indeed, she had the narrow eyes and the high cheekbone of that creature, and as nearly the sinuosity as is compatible with human symmetry. His wooing had been brief but incisive.1921, Ben Travers, chapter 1, in A Cuckoo in the Nest, Garden City, N.Y.: Doubleday, Page & Company, published 1925, →OCLC:
With fresh material, taxonomic conclusions are leavened by recognition that the material examined reflects the site it occupied; a herbarium packet gives one only a small fraction of the data desirable for sound conclusions. Herbarium material does not, indeed, allow one to extrapolate safely: what you see is what you get[…]1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, Chicago, Ill.: Field Museum of Natural History, →ISBN, page vii:
Etymology From Middle English indede, univerbation of the phrase in dede (“in sooth, in fact”). Cognate with Saterland Frisian innerdoat, innedoat (“indeed”), West Frisian yndied (“indeed”), Dutch inderdaad (“indeed”), German in der Tat (“indeed”). By surface analysis, in + deed. Compare in fact, in truth, etc. First attested in the early 14ᵗʰ century.
1
Indicates agreement with another speaker's previous statement.
"I am a great runner." "Indeed!"
2
With interrogative intonation Indicates doubt or disagreement with another speaker's previous statement.