failing

noun
1
a weakness or fault in somebody/something
ضعف, نقص, عیب, کاستی
adjective
1
not achieving something; unsuccessful
ناموفق, ناکام
2
becoming weak
رو به ضعف, در حال ضعیف‌شدن
His last months in office were marred by failing health.
preposition
1
used to introduce a suggestion that could be considered if the one just mentioned is not possible
در صورت عدم امکان, اگر امکان‌پذیر نبود