Internecine
Destructive to both sides in a conflict.
Panacea
A solution or remedy for all difficulties or diseases.
Indefatigable
Persisting tirelessly.
Abstruse
Difficult to understand; obscure.
Ephemeral
Lasting for a very short time.
Moribund
At the point of death; in terminal decline.
Pusillanimous
Showing a lack of courage or determination; timid.
Obsequious
Excessively eager to please or obey.
Perturbation
A state of anxiety or uneasiness.
Recapitulate
To summarize or restate the main points of something.