UNCOUPLED
uncoupled
(adjective) having the coupling undone; “the uncoupled caboose rolled down the incline”
Source: WordNet® 3.1
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
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