défaillant
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Meanings
Adjective
1. faulty (device, system etc.)
2. failing (health, memory)
3. fainting (person)
Examples7
His health is failing.
This engine sometimes gives up the ghost.
The older we grow, the poorer our memory becomes.
"What's wrong?" "The speakers aren't working well."
Something is wrong with this word-processor.
If defective in structure, they are perfect in function.