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Exploit
(verb): to make use of for one's own advantage or profit
The spy rushed back to his homeland to exploit the information he uncovered. -
Chagrin
(noun): feeling of embarrassment and annoyance because one failed or disappointed
Much to the commander's chagrin, his men returned to report they had been played by the enemy. -
Obscure
(adjective): not well-known; not famous
The troops entered an obscure part of town as night fell. -
Interlocutor
(noun): a person taking part in a conversation or dialogue
The emperor entered with his interlocutor grin. -
Incontrovertible
(adjective): not able to be doubted or questioned
The evidence was incontrovertible.