10-Letter Words Containing: EFF

• the ratio of the output to the input of any system

• skillfulness in avoiding wasted time and effort

• the trait of being effeminate (derogatory of a man)

• a lack of efficacy

• in an effusive manner

• become bubbly or frothy or foaming

• a foul-smelling outflow or vapor (especially a gaseous waste)

• A soldier fit for duty

• shortening of the uterine cervix and thinning of its walls as it is dilated during labor

• withdrawing into the background; making yourself inconspicuous