The 16th century origin of the word is the combination of 'come' and 'forth', so literally the word means to come forth with something. For example: I am eagerly anticipating the forthcoming concert. In time, it eventually came to have the meaning of being readily available, honest or open about something.

Does forthcoming mean truthful?

As adjectives the difference between honest and forthcoming

is that honest is (of a person or institution) scrupulous with regard to telling the truth; not given to swindling, lying, or fraud; upright while forthcoming is (not comparable) approaching or about to take place.

What is another word for being honest?

OTHER WORDS FOR honest

1 just, incorruptible, trusty, trustworthy. 2 fair. 4 straightforward, candid. 5, 9 pure.