Such an excuse is not credible (4)
I believe the answer is:
lame
(Other definitions for lame that I've seen before include "Thin plate" , "Rubbish" , "Fabric interwoven with metal threads" , "Halt" , "Unable to walk normally" .)
I believe the answer is:
lame
(Other definitions for lame that I've seen before include "Thin plate" , "Rubbish" , "Fabric interwoven with metal threads" , "Halt" , "Unable to walk normally" .)