Putative (adjective)

1. Generally considered or reputed to be the case or true, but not necessarily so.
2. Commonly supposed or claimed to exist or be the case, although not necessarily so.

Origin:

From latin putativus, from putare (to consider, to think).

Examples:

1. The putative leader of the group was arrested.
2. The putative father of the child refused to take a DNA test.
3. The putative reason for the delay was a computer malfunction.
4. He was the putative heir to the throne.
5. Putative evidence suggests that the fire was started deliberately.