consisting in the absence of something; negative
causing privation; depriving
indicating the absence of something
something that causes privation or indicates an absence
Severely negative or harmful.
Having a chemical nature that is harmful to health or lethal if consumed or otherwise entering into the body in sufficient quantities.
Appearing grossly unwell; characterised by serious, potentially life-threatening compromise in the respiratory, circulatory or other body systems.
Hateful or strongly antipathetic.