If "expressly" means "clearly and explicitly":
* Implicitly: This means something is suggested or understood without being stated directly.
* Tacitly: This means something is understood or agreed to without being openly stated.
* Indirectly: This means something is conveyed in a roundabout or subtle way.
* Vaguely: This means something is unclear or uncertain.
* Ambiguously: This means something has more than one possible meaning.
If "expressly" means "specifically":
* Generally: This means something applies to a broad range of situations.
* Broadly: This means something encompasses a wide scope.
* In a general sense: This means something applies in a non-specific way.
If "expressly" means "for a particular reason":
* Accidentally: This means something happens unintentionally.
* Unintentionally: This means something happens without being planned or intended.
* By chance: This means something happens randomly.
To determine the best opposite of "expressly," consider the specific context in which you are using the word.