Synonyms for In earnest:

• adj.

  •sobersided (adjective)
  • downbeat,
  • austere,
  • bound and determined,
  • honest,
  • contemplative,
  • sedate,
  • deadpan,
  • long-faced,
  • unsmiling,
  • severe,
  • pensive,
  • weighty,
  • stern,
  • genuine,
  • set,
  • resolved,
  • grim,
  • go for broke,
  • reflective,
  • meditative,
  • thoughtful,
  • determined,
  • grave,
  • funereal,
  • solemn,
  • deliberate,
  • bound,
  • steady,
  • cold sober,
  • no nonsense,
  • pokerfaced,
  • unhumorous.

• adv.

  •seriously (adverb)
  • solemnly,
  • zealously,
  • in all conscience,
  • thoughtfully,
  • passionately,
  • cut the comedy,
  • sedately,
  • all joking aside,
  • sternly,
  • determinedly,
  • with a straight face,
  • actively,
  • cool it,
  • fervently,
  • simmer down,
  • with sobriety,
  • for real,
  • vigorously,
  • in all seriousness,
  • purposefully,
  • gravely,
  • soberly,
  • down,
  • intently,
  • with forethought,
  • straighten out.

• adv

  •seriously (adverb)
  • with straight face.

• n.

  •earnestly (noun)
  • earnestly.

• Other synonyms:

  •
  • sobersided,
  • lighten up,
  • staid,
  • stolid,
  • officious.
  •
  • sober,
  • businesslike,
  • no-nonsense,
  • humorless.
  •
  • substantial.
  •
  • deep.
  •Other relevant words:
  • warm,
  • persistently,
  • white-hot,
  • loyal,
  • committed,
  • burning,
  • firmly,
  • honestly,
  • devout,
  • impassioned,
  • perfervid,
  • intense,
  • red hot,
  • hot-blooded,
  • ardent,
  • tooth and nail,
  • flaming,
  • resolute,
  • steadily,
  • hearty,
  • serious,
  • vehement,
  • resolutely,
  • staunchly,
  • spirited,
  • decidedly,
  • fiery,
  • fervid,
  • afire,
  • faithful,
  • abandoned,
  • dedicated,
  • in good earnest,
  • heart and soul,
  • intent,
  • fervent,
  • heated,
  • sincerely,
  • passionate,
  • devoted,
  • hot,
  • hammer and tongs,
  • zealous,
  • sincere.

Antonyms for In earnest:

• adv.

  • seriously
    lightly, casually, minor, trivially, funnily.