Wiktionary
unstoppered
vb. (en-past of: unstopper)
WordNet
unstoppered
adj. (of a container) having the stopper removed; "whiskey spilled from the unstoppered bottle"
Usage examples of "unstoppered".
She unstoppered it and stared at it like it held the keys to the kingdom.
A simple answer: something to stopper up whatever it was that seemed to be coming unstoppered within him, a last trick question to be disposed of, clear the field finally and for good.
Smiling, he unstoppered the tiny vial and let a dark liquid drop onto his fingertip.