Construct — or unlife — is a monster type in ADOM. They are insentient or semi-sentient monsters, that are damaged and destroyed by attacks rather than injured and killed.
Constructs are immune to mindcraft, and cannot be examined using a stethoscope (the message "The -foo- seems rather to be a piece of furniture" is returned). They usually cannot repair themselves (unless by magical means), and most constructs never panic. All constructs are immune to death rays, stunning, paralysis, blindness, and poison. Weapons of vampirism and shadow touch do not provide HP if used against constructs.
The main types of monsters belonging to the construct/unlife category are golems ('Y'), grues('x'), vortices ('V'), elementals ('E'), statues ('Y') and construct humanoids such as gargoyles and margoyles ('I').
Note that although the game most often uses the term "constructs" to refer to the monster type, weapons that slay constructs display the line "It is an unlife slayer" when Greater Identify is applied to them.
Mindcraft and stethoscopes can not be used on constructs.