What is the meaning of middling?

noun

• Any commodity of intermediate quality or size (especially when coarse particles of ground wheat are mixed with bran. )

verb

• Put in the middle.
  • synonyms: middle

adjective

• Lacking exceptional quality or ability.
  • usage: "a novel of average merit"; "only a fair performance of the sonata"; "in fair health"; "the caliber of the students has gone from mediocre to above average"; "the performance was middling at best"
  • synonyms: average, fair, mediocre

adverb

• To a moderately sufficient extent or degree.
  • usage: "pretty big"; "pretty bad"; "jolly decent of him"; "the shoes are priced reasonably"; "he is fairly clever with computers"
  • synonyms: reasonably, moderately, pretty, jolly, somewhat, fairly, passably