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Adjective: hebetudinous
Usage: rare
  1. Lacking in liveliness or animation
    - dull

See also: arid, bovine, colorless [US], colourless [Brit, Cdn], desiccate, desiccated, drab, dreary, dullness, heavy, humdrum, lackluster [US], lacklustre [Brit, Cdn], leaden, lusterless [N. Amer], lustreless [Brit, Cdn], monotonous, monotonousness, spiritless, unanimated