Comment by kevinventullo

There are shades of grey w.r.t. truth, and in many contexts there is a negative correlation between honesty and other factors (e.g. I think of “bluntness” as prioritizing truth over politeness). When I hear or read a sentence beginning with “honestly”, I interpret it to mean the speaker is warning or indicating that they are intentionally opting to be closer to truth at the expense of other factors. Other factors might be contextual appropriateness such as professional decorum, or even the listener’s perception of the speaker’s competence (“Honestly, I don’t know.”)