15-Letter Words Containing: I,N,O,F,F

• in an ineffective manner

• A technique used to detect the reaction between an antigen and an antibody by observing the behavior of a combination of such species as they diffuse through a gel

• a disposition to be distant and unsympathetic in manner

• the bearing of fruit

• organs of fruiting (especially the reproductive parts of ferns and mosses)

• capacity or power to produce a desired effect

• the quality of being offensive