That cannot be overcome or vanquished; unconquerable, invincible. Obsolete or merged in sense A. 3.

Incapable of being vanquished or overcome.

= inexpugnable, adj.

That cannot be vanquished, overcome, or subdued; unconquerable. transferred and figurative (a) of persons in spiritual or mental warfare…

(un-, prefix1 affix 1b.)

That cannot be taken by assault or storm; incapable of being overcome, subdued, or overthrown by… figurative of a statement, argument, principle…

(un-, prefix1 affix 1.)

That cannot be assailed or overcome.

Not to be conquered, invincible.

Invincible.

Not able to be matched in power, status, etc.; unapproachably high; invincible. Obsolete.

(un-, prefix1 affix 1b.)

Insuppressible.

That cannot be overcome.

(un-, prefix1 affix 1b.)

Incapable of being overcome, mastered, brought under control, etc.

That cannot be reduced to submission; invincible, insuperable.

proved or tested in the arsenal at the Tower of London; also allusively.

That cannot be subdued; invincible.

(un-, prefix1 affix 1b.)

Not winnable; esp. of fortresses: Impregnable.