Adjective
uninsulated (not comparable)
Lacking insulation; not insulated
Early 20th-century carbon composition resistors had uninsulated bodies; the lead wires were wrapped around the ends of the resistance element rod and soldered. Source: Internet
Mica is also used as an insulator in concrete block and home attics, and can be poured into walls (usually in retrofitting uninsulated open top walls). Source: Internet
Early 20th century resistors, essentially uninsulated, were dipped in paint to cover their entire body for color-coding. Source: Internet
However, the cables soon began to fail as a result of deteriorating insulation and were replaced with uninsulated wires on poles. Source: Internet