back·stab 
(băkstăb′)
(băkstăb′)tr.v. back·stabbed, back·stab·bing, back·stabs
To disparage or criticize (someone), usually when that person is absent.
backstab′ber n.
- incompetent
- incompetently
- incomplete
- incomplete abortion
- incomplete dominance
- incomplete flower
- incomplete fracture
- incompletely
- incomplete metamorphosis
- incompleteness
- incompletion
- incompliance
- incompliancy
- incompliant
- incompliantly
- incomprehensibility
- incomprehensible
- incomprehensibleness
- incomprehensibly
- incomprehension
- incomprehensive
- incomprehensively
- incompressibility
- incompressible
- incomputability