Weakening
Part of speech: verb
Definition: To make weaker or less strong.
Part of speech: noun
Definition: An instance or process of loss of strength A structural principle of mathematical logic that states that the hypotheses of any derived fact may be freely extended with additional assumptions
Debilitating
Part of speech: adjective
Definition: Causing a loss of energy or strength.
Part of speech: verb
Definition: To make feeble; to weaken.
Example sentence: When I went to Everest, I underestimated things. I just didn't know what altitude could do. Or the cold - I especially didn't appreciate the cold. It can be just debilitating, and things can happen so quickly.