This is the 14790th most frequent Russian word.
плачевно
"Плачевно" means "lamentably" or "pitifully."
The adverb 'плачевно' here describes the manner in which the work was completed, expressing a very poor outcome.
Эта работа выполнена плачевно.
This work is done in a lamentable manner.
The adjective 'плачевными' (instrumental plural form of 'плачевный') is used to describe the results, indicating that they are very disappointing.
Результаты экзамена оказались плачевными.
The exam results turned out to be deplorable.
The word 'плачевно' is used at the beginning of the sentence as an impersonal adverb to express regret or a sad observation about the situation.