The country stood exposed, and defenseless—then others rushed in to help.
Their ability to launch a surprise strike renders us defenseless.
In that African horror, Hutus were slaughtering an estimated 800,000 defenseless Tutsis.
c.1300, "forbidding, prohibition," also "action of guarding or protecting," from Old French defense, from Latin defensus, past participle of defendere "ward off, protect" (see defend). But it also arrived (without the final -e) from Old French defens, from Latin defensum "thing protected or forbidden," neuter past participle of defendere.
Defens was assimilated into defense, but not before it inspired the alternative spelling defence, via the same tendency that produced hence (hennis), pence (penies), dunce (Duns). First used 1935 as a euphemism for "national military resources." Defense mechanism in psychology is from 1913.
defense de·fense (dĭ-fěns')
A means or method that helps protect the body or mind, as against disease or anxiety.