What does certainly mean in crosswords?

certainly means: definitely or positively (‘sure’ is sometimes used informally for ‘surely’)

Which crossword clues can have certainly as the answer?

Possible clues for certainly include "without doubt", "Without doubt".

Word entry · 9 letters

Best crossword clue

"without doubt"

9 letters · collected on this word page

9 lettersPronunciation /ˈsɜː.tn̩.li/Part of speech adverbSorted aceilnrtyStarts with CEnds with Y2 cluesVery common crossword word

1C2E3R4T5A6I7N8L9Y

From Middle English certeynly; equivalent to certain + -ly.

“The torque was "built up" in the special back axle and the car crawled tankwise but very certainly over the obstacles without a jar or hesitation.”
“The accident was certainly caused by human error.”
“That was certainly sweet of him.”

Source: Wiktionary, CC BY-SA 4.0

01“without doubt”9 letters

02“Without doubt”9 letters

Not quite right?

C________