This is the 16924th most frequent Russian word.
солидарный
"Солидарный" means "solidary" or "united in support or action."
Here, 'солидарное' shows the collective agreement or action of the group.
Мы приняли солидарное решение о поддержке проекта.
We made a joint decision to support the project.
The word 'солидарно' emphasizes the unity and combined effort of the individuals.
Они выступили солидарно против несправедливого закона.
They jointly opposed the unfair law.
In this sentence, 'солидарные' highlights the coordinated and unified actions taken towards a shared goal.