UNCOUPLED

uncoupled

(adjective) having the coupling undone; “the uncoupled caboose rolled down the incline”

Source: WordNet® 3.1

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Etymology 1

Adjective

uncoupled (not comparable)

Not coupled to something; disconnected; detached.

Etymology 2

Verb

uncoupled

simple past tense and past participle of uncouple

Source: Wiktionary

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UNCOUPLE

Un*cou"ple, v. t. Etym: [1st pref. un- + couple.]

Definition: To loose, as dogs, from their couples; also, to set loose; to disconnect; to disjoin; as, to uncouple railroad cars.

Un*cou"ple, v. i.

Definition: To roam at liberty. [Obs.] Chaucer.

Source: Webster’s Unabridged Dictionary 1913 Edition

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