adj

• Laughable or amusing through foolishness or a foolish appearance.
  "He cannot achieve celebrity by covering himself with diamonds... or by giving a silly price for a hack."
• (chiefly Scotland, obsolete) Blessed, particularly:
  "The sylyman lay and herde, / And hys wyf answerd."
• (chiefly Scotland, obsolete) Blessed, particularly:
  "... thrie Saturdayes befor Lambas and thrie efter called the six silie Saturdayes."
• (now chiefly Scotland and Northern England, rare) Pitiful, inspiring compassion, particularly:
  "The fire raging upon the silly Carcase."

adv

• (now regional or colloquial) Sillily: in a silly manner.
  "If you did but see how silly a Man fumbles for an Excuse, when he's a little asham'd of being in Love."

noun

• (colloquial) A silly person.
  "While they, poor sillies, bid good night, O' love an' bogles eerie."
• (endearing, gently derogatory) A term of address.
  "‘Come on, silly,’ said Nannie."
• (colloquial) A mistake.