This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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ad. In a sufficient manner; enough.

ad. To a sufficient extent.

ad. To a sufficient degree; to a degree that answers the purpose, or gives content; enough.

To a sufficient degree; to a degree that answers the purpose or gives satisfaction; adequately.

To a considerable degree: as, he went away sufficiently discontented.

ad. to a sufficient degree

"[11] The title sufficiently indicated the contents: _Domenico priori S. Romani tolosani ejusque fratribus, eos in protectionem recipit eorumque Ordinem cum bonis et privilegiis confirmat_."

enough   

efficiently    inefficiently    insufficiently