whatever pron.

Old English hwæt, referring to things in abstraction; also "why, wherefore; indeed, surely, truly," from Proto-Germanic pronoun *hwat (source also of Old Saxon hwat, Old Norse hvat, Danish hvad, Old Frisian hwet, Dutch wat, Old High German hwaz, German was, Gothic hva "what"), from PIE *kwod, neuter singular of *kwos "who," from PIE root *kwo-, stem of relative and interrogative pronouns. Corresponding to Latin quid.

Meaning "what did you say?" is recorded from c. 1300. As an adjective and adverb, in Old English. As a conjunction in late Old English. Exclamatory use was in Old English. What the _____ (devil, etc.) as an exclamation of surprise is from late 14c. As an interrogative expletive at the end of sentences from 1891; common in affected British speech. Or what as an alternative end to a question is first attested 1766. What have you "anything else one can think of" is from 1925. What's up? "what is happening?" first recorded 1881.

"To give one what for is to respond to his remonstrant what for? by further assault" [Weekley]. The phrase is attested from 1873; what for? as introducing a question is from 1760. To know what is what is from c. 1400; I'll tell you what to emphasize what is about to be said is in Shakespeare.

Old English æfre "ever, at any time, always;" of uncertain origin, no cognates in any other Germanic language; perhaps a contraction of a in feore, literally "ever in life" (the expression a to fore is common in Old English writings). First element is almost certainly related to Old English a "always, ever," from Proto-Germanic *aiwi-, extended form of PIE root *aiw- "vital force, life; long life, eternity." Liberman suggests second element is comparative adjectival suffix -re.

Sometimes contracted to e'er in dialect and poetry. Ever began to be used in late Old English as a way to generalize or intensify when, what, where, etc. The sense evolution was from "at any time at all, in any way" to "at any particular time; at some time or another; under any circumstances." Ever so "to whatever extent" is recorded by 1680s. Expression did you ever? (implying "see/do/hear of such a thing") attested by 1840.