Sedulous

Sedulous (pronounced sej-uh-luhs)

(1) Of a person: diligent in application or pursuit or attention; constant and persevering; steadily industrious; assiduous.

(2) Of an activity: carried out with diligence.

(3) Persistently or carefully maintained.

1530–1540: From the Latin sēdulus (diligent, industrious, sedulous; solicitous; unremitting; zealous), an adjectival derivative of the phrase sē dolō (diligently (literally “without guile”) which replaced sedulious.  The origin of sēdulus is murky but it was probably from sēdulō (diligently; carefully; purposely; zealously) and the construct may have been sē- (the prefix meaning “without”) + dolō (singular of dolus (deceit, deception; evil intent, malice (and cognate with the Ancient Greek dolus (ruse; snare), ultimately from the primitive Indo-European del- (to count, reckon) + -us (the suffix forming adjectives).  In English the form was created with the suffix –ous.  The –ous suffix was from the Middle English -ous, from the Old French –ous & -eux, from the Latin -ōsus (full, full of); a doublet of -ose in an unstressed position.  It was used to form adjectives from nouns, to denote possession or presence of a quality in any degree, commonly in abundance.  In chemistry, it has a specific technical application, used in the nomenclature to name chemical compounds in which a specified chemical element has a lower oxidation number than in the equivalent compound whose name ends in the suffix -ic.  For example sulphuric acid (H₂SO₄) has more oxygen atoms per molecule than sulphurous acid (H₂SO₃).  The noun sedulity (diligent and assiduous application, constant attention) sates from 1542.  The synonyms include diligent & assiduous and words which hint at the meaning include constant, untiring & tireless.  Sedulous is an adjective, sedulousness & sedulity are nouns and sedulously is an adverb.

Lindsay Lohan and her lawyer in court, Los Angeles, 2011.

Because of the variations in spelling in Medieval Latin, scholars have debated whether the correct form is sedeō or sē dolō, those of the former citing assiduus, some of the latter insisting even that the construct can only be sē dolus.  It carries the whiff of linguistic snobbery.  Medieval Latin (perhaps better understood by an alternative descriptor: Church Latin), never universally adopted the forms or rules of Classical Latin and within Europe, variations in form were common.