Antonyms of verb hearten

1 sense of hearten

Sense 1
cheer, hearten, recreate, embolden -- (give encouragement to)
       Antonym of dishearten (Sense 1)
      => dishearten, put off -- (take away the enthusiasm of)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb hearten

1 sense of hearten

Sense 1
cheer, hearten, recreate, embolden -- (give encouragement to)
       => encourage -- (inspire with confidence; give hope or courage to)

Antonyms of adj heartening

1 sense of heartening

Sense 1
heartening, inspiriting -- (cheerfully encouraging)

INDIRECT (VIA encouraging) -> discouraging -- (depriving of confidence or hope or enthusiasm and hence often deterring action; "where never is heard a discouraging word")

Similarity of adj heartening

1 sense of heartening

Sense 1
heartening, inspiriting -- (cheerfully encouraging)
       => encouraging (vs. discouraging) -- (giving courage or confidence or hope; "encouraging advances in medical research")