adv. [f. ABSTRUSE + -LY2.] In an abstruse manner; secretly; obscurely.
1611. Cotgr., Secrettement … hiddenly, duskely, abstrusely, mystically.
1686. Basil Valentine, His Last Will & Test., xxii. Be acquainted with its [the Fire-Rod’s] friendlinesse … which is abstrusely hid, and goeth invisibly.
1754. Connoisseur, No. 27, 1 Aug., 160. No writer can flatter himself that his productions will be an agreeable part of the equipage of the tea-table, who writes almost too abstrusely for the study, and involves his thoughts in hard words and affected latinisms.
Mod. The subject is treated too abstrusely to be of interest to the general reader.
