This is the 12047th most frequent Russian word.
значительных
"Significant" or "substantial."
describing substantial achievements.
Павел достиг значительных успехов в учёбе.
Pavel achieved significant success in his studies.
describing substantial size or amount.
Для участия в этом проекте требуются значительных размеров вложения.
Taking part in this project requires significant-sized investments.
indicating that the changes must be considerable or substantial.