If "subtly" refers to being discreet or understated:
* Obviously
* Explicitly
* Directly
* Openly
* Clearly
* Bluntly
If "subtly" refers to being gradual or slow:
* Abruptly
* Suddenly
* Immediately
* Rapidly
* Directly
If "subtly" refers to being subtle or delicate:
* Crudely
* Roughly
* Harshly
* Forcefully
* Powerfully
Example:
* Subtle: "She subtly hinted at her dissatisfaction with the project."
* Opposite: "She openly criticized the project."
To find the most accurate opposite, consider the specific context in which "subtly" is used.