adj.
Pronunciation: ˌ ə n- ' f ā -li ŋ
Function: adjective
Date: 14th century
: not failing or liable to fail: a : CONSTANT , UNFLAGGING < unfailing courtesy> b : EVERLASTING , INEXHAUSTIBLE <a subject of unfailing interest> c : INFALLIBLE , SURE <an unfailing test>
– un · fail · ing · ly \ -li ŋ -l ē \ adverb