Worn ragged — drained and on-edge from sustained stress, fatigue, or overload..
Worn ragged — drained and on-edge from sustained stress, fatigue, or overload.
Frazzled is the look and feel of fraying: nerves worn thin, energy spent, patience down to its last threads — Merriam-Webster's "a state of extreme physical or nervous fatigue and agitation," and figuratively "damaged or weakened by strain ... frayed." The defining note is duration and depletion. Where rattled is a single jolt and flustered a momentary tangle, frazzled is the cumulative residue of too much for too long: the frazzled parent, the frazzled commuter, frazzled nerves. It pairs exhaustion with low-grade agitation — the tiredness is jangly, not restful. It is more colloquial and slightly wry in register, often half-rueful, and less catastrophic than overwhelmed (which is acute submersion); frazzled is more about being worn down than swamped.
Past-participle adjective of the verb frazzle (c. 1825), originally "to unravel" (of clothing), from an East Anglian variant of 17c. "fasel" (to unravel, fray), from Middle English facelyn "to fray" (mid-15c.), from fasylle "fringe, frayed edge," a diminutive of Old English fæs "fringe, border"; probably influenced in form by "fray." The noun frazzle "worn-out condition" is 1865, American English. (Merriam-Webster dates the adjective "frazzled" to 1854.)
Frazzle is rooted in textile imagery — the literal unraveling or fraying of cloth and rope — and that picture remains alive in the modern figurative sense: a frazzled person is, in effect, coming apart at the edges from strain. The emotional meaning developed in 19th-century American usage (the noun "worn-out condition" from 1865; the adjective by 1854), and the literal "frayed" sense still coexists (frazzled nerves). The shift from fraying fabric to frayed nerves is a clean, well-attested metaphor.