unerring
Concise Oxford English Dictionary © 2008 Oxford University Press:
unerring/ʌnˈɜːrɪŋ/
▶adjective always right or accurate.
– derivatives
unerringly adverb,
unerringness noun.
unerringly adverb,
unerringness noun.
'unerring' also found in these Oxford entries:

