noun

• (obsolete) Love play, amorous dalliance; fondling.
  "Then seemed him his Lady by him lay, / And to him playnd, how that false winged boy, / Her chast hart had subdewd, to learne Dame pleasures toy."
• (obsolete) A vague fancy, a ridiculous idea or notion; a whim.
  "Though they do talk with you, and seem to be otherwise employed, and to your thinking very intent and busy, still that toy runs in their mind, that fear, that suspicion, that abuse, that jealousy […]."
• (obsolete) An old story; a silly tale.
  "More strange than true: I never may believe these antique fables, nor these fairy toys."
• (Scotland, archaic) A headdress of linen or wool that hangs down over the shoulders, worn by elderly women of the lower classes.
  "Having, moreover, put on her clean toy, rokelay, and scarlet plaid."

verb

• (intransitive) To play (with) in an idle or desultory way.
  "to toy with a piece of food on one’s plate"
• (intransitive) To ponder or consider.
  "I have been toying with the idea of starting my own business."
• (slang, transitive) To stimulate with a sex toy.
  "He could see her hand go to her slit, and soon she was toying herself along, breathing heavily."

adj

• (chiefly attributive) Impractical or unsuitable for real-world use, due to being unrealistically small or simple.
  "Our evaluation scenarios are purposefully simplistic […] This implies that the scenarios are quite toy and not representative of real deployments."