“grateful”

Feeling or expressing gratitude for something received or experienced.

“She was deeply thankful for the stranger who pulled her out of the storm.”

Best for: A step above 'grateful' in warmth; works well in personal, heartfelt writing.

Showing recognition and enjoyment of the good qualities of someone or something.

“He was quietly appreciative of every small kindness she offered without fanfare.”

Best for: Slightly more refined; suits professional or measured emotional contexts.

Owing a debt of gratitude to someone for a service or favor rendered.

“She felt beholden to the editor whose single letter had changed the course of her career.”

Best for: Carries a sense of obligation alongside gratitude; ideal for literary or formal prose.

Owing gratitude to another for help or a significant kindness.

“He remained profoundly indebted to the professor who had believed in him when no one else would.”

Best for: Emphasizes a lasting, weighty sense of owing; strong in speeches or memoirs.

Feeling a sense of gratitude and duty toward someone who has done one a service.

“She was much obliged to the conductor who held the train one extra minute for her.”

Best for: Formal and slightly old-fashioned; works beautifully in period fiction or dry wit.

Acutely aware of and grateful for a kindness or benefit received (archaic usage).

“He was sensible of every sacrifice she had made and carried that knowledge like a quiet debt.”

Best for: A rare archaic sense; stunning in historical fiction or elevated literary prose.