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• a  lacking force; feeble
  a forceless argument

• A forceless father, a smothering mother, an adolescence strangled with apron strings.
• These are not the kinds of problems to be handled by subordinates, committees or forceless task forces.
• At first Savonarola had little success among the Dominicans, a preaching order, for he was as forceless a speaker as the tyro Demosthenes.

• unforceful

• forceful