1. (adj)earnest something of value given by one person to another to bind a contract Antonyms: frivolous, purposeless, insincere
2. (adj)earnest, sincere, solemn characterized by a firm and humorless belief in the validity of your opinions Synonyms: dear, heartfelt, businesslike, sincere, grave, sedate, earnest, sober, devout, solemn Antonyms: frivolous, insincere, purposeless
4. (adj)businesslike, earnest not distracted by anything unrelated to the goal Synonyms: sincere, businesslike, devout, earnest, solemn, heartfelt, dear Antonyms: insincere, frivolous, purposeless
Synonyms, Thesaurus & Antonyms of 'earnest'
English Synonyms and Antonyms
1. earnest One is eager who impatiently desires to accomplish some end; one is earnest with a desire that is less impatient, but more deep, resolute, and constant; one is anxious with a desire that forese Synonyms: eager, animated, desirous, glowing, importunate, longing, anxious, earnest, hot, intense, vehement, ardent, enthusiastic, impatient, intent, yearning, burning, fervent, impetuous, keen, zealous Antonyms: apathetic, cool, indifferent, regardless, unconcerned, calm, dispassionate, negligent, stolid, uninterested, careless, frigid, phlegmatic, stony, unmindful, cold, heedless, purposeless, stupid, unmoved
Synonyms for earnest 
