
1) Bad 2) Deteriorating 3) Disappearing 4) Dying 5) Failed 6) Fault 7) Flaw 8) Imperfection 9) Inadequacy 10) Insufficiency 11) Lapse 12) Senile 13) Sin 14) Unsatisfactory 15) Unsuccessful 16) Weakening 17) Weakness
Found on
https://www.crosswordclues.com/clue/failing

1) Failed 2) Unable to find a defect in 3) Unsuccessful
Found on
https://www.crosswordclues.com/clue/failing

- a flaw or weak point
- be unsuccessful
- disappoint, prove undependable to; abandon, forsake
- stop operating or functioning
- be unable
- judge unacceptable
- fall short in what is expected
- prove insufficient
- get worse
Found on

• (p. pr. & vb. n.) of Fail • (n.) A failing short; a becoming deficient; failure; deficiency; imperfection; weakness; lapse; fault; infirmity; as, a mental failing. • (n.) The act of becoming insolvent of bankrupt.
Found on
http://thinkexist.com/dictionary/meaning/failing/
Fail'ing noun 1. A failing short; a becoming deficient; failure; deficiency; imperfection; weakness; lapse; fault; infirmity; as, a mental
failing . « And ever in her mind she cast about For that unnoticed
failing in herself.»
Tennyson. 2. The act of...
Found on
http://www.encyclo.co.uk/webster/F/3

[
adj] - below acceptable in performance 2. [n] - a flaw or weak point 3. [n] - failure to reach a minimum required performance
Found on
http://www.webdictionary.co.uk/definition.php?query=failing
adjective below acceptable in performance; `received failing grades`
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.