13-Letter Words Containing: N,I,F,F

• A cycloalkane.

• in an ineffective manner

• evergreen perennial herbs of tropical America with lush foliage and poisonous sap; often cultivated as houseplants

• a lack of competence

• (pathology) inability of a bodily part or organ to function normally

• lack of an adequate quantity or number

• European breed of small dog resembling a terrier with dark wiry hair and a tufted muzzle

• in a standoffish manner

• Pertaining to a taxon at a rank lower than species.

• in a not unpleasantly offensive manner

• power to be effective; the quality of being able to bring about an effect

• capacity to produce strong physiological or chemical effects