1.
If you describe something, especially something unpleasant, as ~, you mean that it goes on for a long time and cannot be stopped.
...the ~ pressure of recession and financial constraint.
= relentless
ADJ
~ly
There have been record bankruptcies and ~ly rising unemployment.
ADV: usu ADV with v
2.
Someone who is ~ is prepared to be cruel to other people and feels no pity for them.
...the capacity for quick, ~ violence.
ADJ
~ly
They ~ly beat up anyone they suspected of supporting the opposition.
ADV: ADV with v