suru verb (special)
play with; toy with; use (tricks, sophistry)
Often implies using something in a clever, manipulative, or playful way. Common with words like 詭弁 (sophistry), 策略 (trick), or 言葉 (words).
彼は会議で巧みに詭弁を弄した。
He skillfully used sophistry at the meeting.
The child is playing with building blocks.
suru verb (special)
deride; scoff at; make fun of
Rare, literary usage. Often appears in the pattern ～を弄する, where the object is a person or their weakness.
彼は人の失敗を弄するような言い方をした。
He spoke in a way that made fun of others' mistakes.