The phrase "a significant and probably" is correct and usable in written English.
It can be used when discussing something that is important and likely to happen or be true, often in a speculative context.
Example: "There is a significant and probably increasing risk of data breaches in the current digital landscape."
Alternatives: "a considerable and likely" or "an important and possibly".
"A significant, and probably visible, orbital outpost transiting over most of the world would be a potent political symbol".
As the midterms near, there are signs that an energized base of women will play a significant — and probably defining — role in the outcome.
This study provides new evidence of permafrost-induced ground deformations in France and strongly suggests that thermokarst played a significant and probably largely underestimated role in the genesis of Late Pleistocene landscapes.
"A significant, and probably visible, orbital outpost transiting over most of the world would be a potent political symbol". China often chooses poetic names for its space projects, such as Chang'e – after the moon goddess – for its lunar probes; its rocket series, however, is named Long March, in tribute to communist history.
By focusing on the process mechanisms our aim was to find a significant and probably more general relationships between the likelyhood of shallow landsliding and one single combined topographic factor.
Actual scientific reports suggest that rumination is a significant, and probably prognostic, factor for depression.
"The ICC suffers a further, significant and probably irremediable defect … The treaty-based permanent court has been ratified by only 121 of the approximately 200 countries of the world.
"The management of this kind of setup is much more challenging," the banker said, "so a buyer for this company would probably be somebody already in the business in a significant way and probably in the United States".
Misspelled or not, and from an official White House account or not, that was a significant communication and probably illegal for him to attempt to destroy.
Objective: To establish the predictive value of the observation of a "cobblestone" pattern of the distal tube mucosa shown on the selective salpingogram as an indicator of significant and probably irreparable damage to the ciliated epithelium.
The vitamin released by the film after 4 hours was able to reach the deepest layers of the stratum corneum in a significant amount and probably efficiently attain the viable skin layers.
