This is the 7628th most frequent French word.
regrettablement
Regrettably.
In this sentence, 'regrettablement' functions as an adverb expressing a sense of regret in relation to missing the train.
Regrettablement, nous avons manqué le train.
Regrettably, we missed the train.
Here, 'regrettablement' is used to emphasize the unfortunate nature of the situation regarding the project's completion.
Regrettablement, il ne sera pas possible de terminer le projet à temps.
Regrettably, it will not be possible to complete the project on time.
In this context, 'regrettablement' highlights the undesirable circumstance of limited options available.