Wiktionary
a. Not pledged; not committed.
WordNet
adj. not promised in marriage; "continued seeing him but on an unengaged basis" [syn: unengaged, unpromised]
Usage examples of "unpledged".
Even if they sent out a call for unpledged Falconers they could put no true army in the field.
There would be dozens of unwedded and unpledged elven women there tonight, from children still playing with dolls to widows with power and property of their own.
Indeed, madam, I shall make the forgiveness of the liberties I have taken in this room the condition of my giving that information which shall restore to the Marchioness of Dorrington the gem of which I deprived her--a gem which is still unpledged, and in the possession of one who will restore it on an application, accompanied by a letter in my handwriting.