adjective 1.not open to attack or assault, as by military
force or argument:
unassailable fortifications; unassailable logic. 2.not subject to denial or dispute:
Shakespeare's genius gives his works an unassailable position in world literature.
Origin: 1590–1600; un-1 +
assailable Related forms un·as·sail·a·bil·i·ty, un·as·sail·a·ble·ness, noun
un·as·sail·a·bly, adverb