ppl. a. [UN-1 8.] Not fixed or closed with solder. Also fig.
1641. J. Taylor (Water P.), Reply (title-p.), A Rusty, Rayling, Lying Libell, lately written by an impudent unsoderd Ironmonger.
1876. Preece & Sivewright, Telegraphy, 303. The soldering iron, and fire-pot, are more or less cumbersome, and lead to unsoldered joints remaining in the wire.
1891. W. Clark Russell, Curatica, 104. If he is a plumber, he will not leave your pipes unsoldered.