debilitating
Concise Oxford English Dictionary © 2008 Oxford University Press:
debilitate /dɪˈbɪlɪteɪt/
▶verb (often as adj. debilitating) make very weak and infirm.
– derivatives
debilitatingly adverb,
debilitation noun,
debilitative adjective.
debilitatingly adverb,
debilitation noun,
debilitative adjective.
– origin C16 (earlier (ME) as debilitation): from L. debilitat-, debilitare ‘weaken’, from debilitas, from debilis ‘weak’.
'debilitating' also found in these Oxford entries:

