Kind honesty does sometimes require more thought but it is worth it.
I try to remember that 'honesty' and 'truth' are not necessarily synonymous. What I honestly think may not be truth. It's only my opinion.
That popular phrase "brutal honesty" could be shortened to just 'brutal.' Moreover, if I am brutally honest, I may as well save my breath. The hearer will be so busy processing hurt and resentment and anger, they won't even hear the 'truth' I think I told them.