fac-, facil-, fact-, feas-, -feat, -fect, -feit, -facient, -faction, -fic-, -fy, -ficate, -fication

(Latin: to make, to do, to build, to cause, to produce; forming, shaping)

indemnification
indemnifier
indemnify
ineffective
ineffectiveness
ineffectual
ineffectually
ineffectualness
inefficacity (s) (noun), inefficacities (pl)
The deficiency in producing a intended effect; inefficacy; ineffectiveness: Because James didn't do his homework and didn't pay much attention during the lessons in school, a condition of inefficacity arose and James flunked and had to repeat the school year.
inefficiency
inefficient
inefficiently
infect
infection
infectious