undefendable

Admits no argument

Undefendable describes something that cannot be successfully defended—whether a military position, an argument, or an action.

A fort without walls is undefendable against attack; a claim without evidence is undefendable in debate.

The word overlaps with indefensible but tends toward literal defense rather than moral justification: The outpost was undefendable with so few troops.

argument

untenable

Impossible to maintain

groundless · unsubstantiated · unfounded · illogical · irrational · unreasonable · invalid · unsound · flawed · fallacious

military

vulnerable

Open to attack

unprotected · assailable · open · penetrable · accessible · weak · unsecured · unguarded · breachable · attackable

legal

unwinnable

Impossible to triumph in

futile · impossible · unjustifiable · inadmissible · unprovable · baseless · frivolous · meritless · groundless · unsalvageable

moral

unjustifiable

Cannot be reasonably defended

reprehensible · unacceptable · unwarranted · wrongful · immoral · unethical · illegitimate · unprincipled · shameful · disgraceful

Opposites
military/strategic defensibility

undefendabledefendable

Can withstand assault

defensible · fortified · impregnable · secure · protected

defensibility/justification

undefendabledefendable

Can withstand assault

defensible · justifiable · excusable · supportable · warranted

Family

defend, defendable, defender, defenders, defense, defenses, defensive, defensively, defensiveness

Familiarity
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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G