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indefensible
01
(of theories) lacking a sustainable evidentiary or rational basis against challenges to its validity
02
cannot be justified or reasonably defended due to lacking ethical, logical or valid reasons
03
not able to be protected against attack
indefensible
adj
defensible
adj
defense
n
defend
v
Example
Once Einstein published his paper on general relativity in 1915, Newtonian mechanics became indefensible as the sole explanatory framework for phenomena like Mercury's orbit.
The theory that the earth is flat is indefensible in the face of clear geological and astronomical evidence that demonstrates our planet is spherical.
Citing conspiracy theories as evidence, the senator proposed indefensible claims that lacked legitimate factual support.
The ethics board condemned the experimentation on human subjects without consent as wholly unjustifiable and called for sanctions for such indefensible actions.
The decision to fire employees without cause left the company open to lawsuits since its actions were clearly indefensible.
