I have 3 words you can use:
1. To fade
2. To decay
3. To weaken
"Failing" is a word for growing weaker.
to fade
Did you lose your dictionary?
Stale
The word you are looking for is "dehydrate."
Jealous
to lose or give up
A similar meaning to lose , loser.
lose
The body uses energy to work out; energy ends up as heat. If you cannot radiate or otherwise lose the extra heat, you become warm.
grow elderly, lack of energy, become old, lose zest,
You will become sick from a lack of nutrients, will lose weight, and will have no energy.
low ionization energy