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".

certainly is also used as a crossword clue. The answer is often surely, 6 letters.

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

Is this your crossword clue?

"certainly" is also used as a crossword clue. If that's what you saw, the answer is often surely (6 letters).

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________