1. hitherto

Definition: until now or until a particular time:

Example: Mira revealed hitherto unsuspected talents on the dance floor.

2) heretofore:

definition: until this time before now

Examples: Heretofore her writing has never displayed such depth of feeling.

This technology has created heretofore unimaginable possibilities.

Both terms have the sense of "sth being the case or not being the case for a long time till this point of time"