noun

• (slang) A thing or person whose actual name is unknown or forgotten.
  "As far as I'm concerned Alec is dead. Whatever they've got in there, that...whatever."

det

• (interrogative) What ever; emphatic form of 'what'.
  "Good heavens! Whatever time is it?!"

pron

• (interrogative) What ever; emphasised form of 'what', used to ask which thing, event, circumstance, etc.
  "Whatever do you mean?"
• (fused relative) Anything that; all that.
  "Do whatever works."
• (informal) Anything; thing(s) of unspecified kind, or no matter what kind; sometimes used to indicate that the speaker does not care about options.
  "I don't need any of this stuff, so take whatever."

adv

• (with negative) At all; in any way; whatsoever.
  "There is no point whatever in going on with this discussion."
• (interrogative) In what way; to what extent.
  "Whatever does it matter now?"