moribund

Concise Oxford English Dictionary © 2008 Oxford University Press:
moribund /ˈmɒrɪbʌnd/

▶adjective

• 1 at the point of death.

• 2 in terminal decline; lacking vigour.

– derivatives
moribundity noun.

– origin C18: from L. moribundus, from mori ‘to die’.