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Adjective: spiritless  spi-rit-lus
  1. Evidencing little spirit or courage; overly submissive or compliant
    "a fine fiery blast against spiritless conformity";
    - meek
  2. Lacking ardour, vigour or energy
    "a spiritless reply to criticism"

See also: animation, apathetic, bloodless, brio, dispirited, dull, heartless [archaic], hebetudinous [rare], invigoration, listless, meh [informal], spiritedness, submissive, thin, unenthused, unenthusiastic, vivification

Antonym: spirited