General antonyms:
* Suppress: To hold back or restrain from expressing.
* Conceal: To hide or keep secret.
* Withhold: To refrain from giving or expressing.
* Silence: To make quiet or keep from speaking.
* Mute: To make speechless or prevent from speaking.
Antonyms related to specific meanings of "verbalize":
* Internalize: To keep thoughts or feelings within oneself instead of expressing them.
* Imply: To suggest something indirectly, rather than stating it directly.
* Nonverbalize: To communicate without using words (e.g., through gestures, facial expressions, or body language).
The best antonym will depend on the specific situation and the intended meaning.