Indeed means really and truly, used to strengthen what was said. Very good indeed, indeed it is, indeed, he refused.
After an adjective with very it intensifies — very good indeed. Alone it agrees emphatically, and said flatly it can do the exact opposite, conveying polite disbelief, which is a very English use. A friend in need is a friend indeed is the proverb. Note that the word is in plus deed, once written as two.
1adverbindeedReally and truly.
“Thank you very much indeed for your help.”
indeed is an intensifier.
Middle English in dede, in fact or in deed, run together into one word. The deed here means an act or fact.
Middle English
indede
English, today
indeed
Built from
From Middle English indede, univerbation of the phrase in dede (“in sooth, in fact”). Cognate with stq innerdoat, innedoat (“indeed”), West Frisian yndied (“indeed”), Dutch inderdaad (“indeed”), German in der Tat (“indeed”). by surface analysis, en + in + deed. Compare in fact, in truth, etc. early 14th century.
Etymology from Wiktionary, CC BY-SA