Steady
Middle English (in the sense ‘unwavering, without deviation’): from stead + -y1. The verb dates from the mid 16th century.
wiktionary
From Middle English stede, stedi, stidiʒ, from Old English stæþþiġ, from stæþ(“stead, bank”); equivalent to stathe + -y or stead + -y. Cognate with West Frisian stadich(“slow”), Danish stedig, stadig, steeg, Swedish stadig, Icelandic stöðugur, Middle Dutch stedigh, German stätig, stetig.
etymonline
steady (adj.)
1520s, "firmly fixed in place or station" (replacing earlier steadfast), from stead + adjectival suffix -y (2), perhaps on model of Middle Dutch, Middle Low German stadig. Old English had stæððig "grave, serious," and stedig "barren," but neither seems to be the direct source of the modern word. Old Norse cognate stoðugr "steady, stable" was closer in sense. As an adverb from c. 1600.
Originally of things; of persons or minds from c. 1600. Meaning "working at an even rate" is first recorded in 1540s. Steady progress is etymologically a contradiction in terms. Steady state first attested 1885; as a cosmological theory (propounded by Bondi, Gold, and Hoyle), it is attested from 1948. Related: Steadily.
steady (v.)
1520s, transitive and intransitive, from steady (adj.). Related: Steadied; steadying.
steady (n.)
1792, "a steady thing or place," from steady (adj.). From 1885 as "something that holds another object steady." Meaning "one's boyfriend or girlfriend" is from 1897; to go steady is 1905 in teenager slang.
