The cause of this was initially uncertain, sparking fears that it could end his career.

The exact taxonomic placement of this group was initially uncertain and controversial.

Warners studio was initially uncertain what to make of the film.

His control of the surrounding areas was initially uncertain.

Foreign regimes were initially uncertain as to the level of support to give to the new government.

Hasbro was initially uncertain about making villain toys, believing this wouldn't sell.

The disposition of the boat was initially uncertain.

Although the center of the depression was initially uncertain, it slowly strengthened and steadily organized.

Her casting was initially uncertain, given that she turned down the role three times.

Given these factors, it was initially uncertain whether the offensive would go forward.