indeed

Etymology

From Middle English indede, contraction of the phrase in dede (“in sooth, in fact”); equivalent to in + deed (similar in formation to in fact, in truth, etc.). Cognate with Saterland Frisian innerdoat, innedoat (“indeed”), West Frisian yndied (“indeed”), Dutch inderdaad (“indeed”), German in der Tat (“indeed”). First attested in the early 14ᵗʰ century.

adv

1. (modal) Truly; in fact; actually.
   Indeed, he made several misplays.
   Yes, I do indeed look very similar to you.
   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. 1922, Ben Travers, chapter 1, in A Cuckoo in the Nest
   [The researchers] noticed many of their pieces of [plastic marine] debris sported surface pits around two microns across. Such pits are about the size of a bacterial cell. Closer examination showed that some of these pits did, indeed, contain bacteria,[…]. 2013-07-20, “Welcome to the plastisphere”, in The Economist, volume 408, number 8845
2. (degree, after the adjective modified) In fact.
   As a soccer player, he is terrible indeed.

intj

1. Indicates emphatic agreement.
   "I am a great runner." "Indeed!"
2. With interrogative intonation (low-high) indicates serious doubt.
   "I am a great runner." "Indeed?"