What is the meaning of exploited?

verb

• Use or manipulate to one's advantage.
  • usage: "He exploit the new taxation system"; "She knows how to work the system"; "he works his parents for sympathy"
  • synonyms: exploit, work
• Draw from; make good use of.
  • usage: "we must exploit the resources we are given wisely"
  • synonyms: exploit, tap
• Work excessively hard.
  • usage: "he is exploiting the students"
  • synonyms: overwork, exploit

adjective

• Developed or used to greatest advantage.
• Of persons; taken advantage of.
  • usage: "after going out of his way to help his friend get the job he felt not appreciated but used"
  • synonyms: ill-used, put-upon, used, victimized, victimised