Directly: This emphasizes a clear and direct action or communication.
Clearly: This refers to something easily understood or perceived.
Distinctly: This means clearly recognizable or noticeable.
Specifically: This indicates a precise and detailed manner.
Explicitly: This suggests leaving no room for ambiguity or interpretation.
Precisely: This emphasizes accuracy and detail.
Definitely: This conveys certainty and conviction.
The best opposite will depend on the specific situation and the intended meaning.