B1
used to emphasize that you are telling the truth
Dictionary examples:
Honestly, I thought my gym membership would make me fit without exercising! (0.0)
Honestly, I thought 'smartphone' meant it could make coffee too! (0.0)
Honestly, I thought 'deadline' meant the line where my desk ends! (0.0)
Thanks, but I honestly couldn't eat another piece of cake. (38.0)