Adjective
Romantic - Describing actions, gestures, or situations that are intended to convey deep feelings of love, often in a thoughtful or sentimental manner.

He gave her a romantic gift for their anniversary, along with a hand-written letter expressing his love and appreciation.
Relentless - Referring to something that is constant and never diminishes in force, either in a positive or negative direction.

Her relentless pursuit of success paid off after years of hard work and determination, earning her a top position in the company.