Solution

UNDOUBTEDLY

2 clues

Certainly

Word class: Adverb
Nature of clue: Synonym
Difficulty: Very easy
Sources: Boatload Puzzles

Other solutions to Certainly

Surely

Word class: Adverb
Nature of clue: Synonym
Difficulty: Very easy
Sources: Boatload Puzzles

Other solutions to Surely

Words are categorized by artificial intelligence: there can be mistakes.