Look closely at the following Latin verbs, all of which are derived from the verb trudere ("to push, thrust"): extrudere, intrudere, obtrudere, protrudere. Remove the last two letters of each of these and you get an English descendant whose meaning involves pushing or thrusting. Another trudere offspring, abstrudere, meaning "to push away" or "to conceal," gave English abstrude, meaning "to thrust away," but that 17th-century borrowing has fallen out of use. An abstrudere descendant that has survived is abstruse, an adjective that recalls the meaning of its Latin parent abstrūsus, meaning "concealed."
Her subject matter is abstruse. you're not the only one who finds Einstein's theory of relativity abstruse
Recent Examples on the WebThe procedures are so abstruse that a parliamentarian must sit below the presiding officer and, essentially, tell him or her what to say. Margaret Talbot, The New Yorker, 11 Aug. 2021 The procedures are so abstruse that a parliamentarian must sit below the presiding officer and, essentially, tell him or her what to say. Margaret Talbot, The New Yorker, 11 Aug. 2021 The procedures are so abstruse that a parliamentarian must sit below the presiding officer and, essentially, tell him or her what to say. Margaret Talbot, The New Yorker, 11 Aug. 2021 The procedures are so abstruse that a parliamentarian must sit below the presiding officer and, essentially, tell him or her what to say. Margaret Talbot, The New Yorker, 11 Aug. 2021 The procedures are so abstruse that a parliamentarian must sit below the presiding officer and, essentially, tell him or her what to say. Margaret Talbot, The New Yorker, 11 Aug. 2021 The procedures are so abstruse that a parliamentarian must sit below the presiding officer and, essentially, tell him or her what to say. Margaret Talbot, The New Yorker, 11 Aug. 2021 The procedures are so abstruse that a parliamentarian must sit below the presiding officer and, essentially, tell him or her what to say. Margaret Talbot, The New Yorker, 11 Aug. 2021 The procedures are so abstruse that a parliamentarian must sit below the presiding officer and, essentially, tell him or her what to say. Margaret Talbot, The New Yorker, 11 Aug. 2021 See More
Word History
Etymology
borrowed from Latin abstrūsus "concealed, recondite," from past participle of abstrūdere "to conceal," from abs- (variant of ab-ab- before c- and t-) + trūdere "to push, thrust" — more at threat entry 1