un ‧ fail ‧ ing /ʌnˈfeɪlɪŋ/ BrE AmE adjective
[ Word Family: noun : ↑ fail , ↑ failure , ↑ failing ; adjective : ↑ failed , ↑ unfailing ; verb : ↑ fail ; adverb : unfaillingly]
always there, even in times of difficulty or trouble
unfailing help/support etc
I’d like to thank you all for your unfailing support.
She battled against cancer with unfailing good humour.
—unfailingly adverb :
The staff are unfailingly polite.