What is the best synonym for forthright?

It depends on the context, but here are some good synonyms for "forthright," depending on the nuance you want to convey:

Directness and Honesty:

* Frank

* Candid

* Sincere

* Straightforward

* Blunt

* Open

* Honest

* Unreserved

Confidence and Assertiveness:

* Bold

* Outspoken

* Assertive

* Confident

* Fearless

Other Synonyms:

* Straight-talking

* Plain-spoken

* Unpretentious

Examples:

* Frank would be a good choice if you want to emphasize honesty.

* Blunt would be appropriate if you want to emphasize directness to the point of being abrupt.

* Bold would be a good choice if you want to emphasize confidence.

The best synonym for "forthright" will depend on the specific context and the nuance you want to convey.