Adjective
unpressurized (not comparable)
Not pressurized.
Avionics AN/APY-1 antenna array in the National Electronics Museum The unpressurized rotodome is 30 feet (9.1 m) in diameter, six feet (1.8 m) thick at the center, and is held 11 feet (3.4 m) above the fuselage by two struts. Source: Internet
Methanol burns well in an unpressurized burner, so alcohol stoves are often very simple, sometimes little more than a cup to hold fuel. Source: Internet
Späte 1989, p. 252. As the cockpit was unpressurized, the operational ceiling was limited by what the pilot could endure for several minutes while breathing oxygen from a mask, without losing consciousness. Source: Internet
The Il-12 was very similar in design to American Convair 240, except was unpressurized. Source: Internet