What is the meaning of apt?

adjective

• Usually followed by `to'. ( naturally disposed toward)
  • usage: "he is apt to ignore matters he considers unimportant"; "I am not minded to answer any questions"
  • synonyms: disposed, given, minded, tending
• At risk of or subject to experiencing something usually unpleasant.
  • usage: "he is apt to lose"; "she is liable to forget"
  • synonyms: liable
• Mentally quick and resourceful."an apt pupil"; "you are a clever man... You reason well and your wit is bold-Bram Stoker
  • synonyms: clever
• Being of striking appropriateness and pertinence.
  • usage: "the successful copywriter is a master of apposite and evocative verbal images"; "an apt reply"
  • synonyms: apposite, pertinent