sin ‧ gu ‧ lar ‧ ly /ˈsɪŋɡjələli, ˈsɪŋɡjʊləli $ -lərli/ BrE AmE adverb formal
[ Word Family: noun : ↑ single , singles, ↑ singleness , the singular, ↑ singularity ; adverb : ↑ singly , ↑ singularly ; adjective : ↑ single , ↑ singular ]
in a way that is very noticeable or unusual:
a singularly foolish plan
He has singularly failed to live up to his promises.