What is the opposite of word sly?

The opposite of "sly" depends on the specific meaning you're aiming for. Here are a few options:

Directness/Honesty:

* Honest

* Frank

* Open

* Forthright

* Candid

Naivety/Simplicity:

* Naive

* Innocent

* Simple

* Straightforward

Openness/Transparency:

* Transparent

* Obvious

* Clear

* Direct

The best opposite for "sly" will depend on the context of the sentence. For example:

* "He was sly about his intentions" could be contrasted with "He was honest about his intentions."

* "She had a sly smile" could be contrasted with "She had a naive smile."

Ultimately, the best opposite word will depend on the nuance you want to convey.