Unerringly is an adverb that means ACCURATELY and precisely. It is derived from the word 'ERR, ' which means to make a mistake. Therefore, unerringly implies that no mistakes were made. The crossword solutions for the term unerringly are ACCURATELY (10 letters), LITERALLY (9 letters), and EXACTLY (7 letters). All three of these words mean the same thing, but they are used in different contexts. ACCURATELY implies that something was done with precision and accuracy, while LITERALLY implies that something was done EXACTLY as it was said or written. Finally, EXACTLY implies that something was done without any deviation from what was expected. All three of these words can be used to describe the term unerringly.