earnest

(noun) something of value given by one person to another to bind a contract.

(adj) characterized by a firm and humorless belief in the validity of your opinions. Synonyms: sincere, solemn. Examples: "Both sides were deeply in earnest, even passionate." "An entirely sincere and cruel tyrant." "A film with a solemn social message."

(adj) earnest. Synonyms: dear, devout, heartfelt. Examples: "One's dearest wish." "Devout wishes for their success." "Heartfelt condolences."

(adj) not distracted by anything unrelated to the goal. Synonyms: businesslike.