stolidness

/ˈstɑlɪdnəs/
noun
  1. The state or quality of being stolid; lack of emotion or reaction.
    • The stolidness of the old librarian made the children too nervous to ask questions.
    • His stolidness during the argument only made his opponent more frustrated.
    • There was a certain stolidness in the way she faced every challenge, never flinching.
Antonyms
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