Nouns

(n)earnestsomething of value given by one person to another to bind a contract

Adjectives

(s)earnest, sincere, solemncharacterized by a firm and humorless belief in the validity of your opinions“both sides were deeply in earnest, even passionate”, “an entirely sincere and cruel tyrant”, “a film with a solemn social message”
(s)dear, devout, earnest, heartfeltsincerely earnest“one's dearest wish”, “devout wishes for their success”, “heartfelt condolences”
(s)businesslike, earnestnot distracted by anything unrelated to the goal