confidant
noun
[ ˈkɒnfɪdant ]
• a person with whom one shares a secret or private matter, trusting them not to repeat it to others.
• "a close confidante of the princess"
Similar:
close friend,
bosom friend,
best friend,
close associate,
companion,
crony,
intimate,
familiar,
second self,
mentor,
adviser,
counsellor,
alter ego,
consigliere,
chum,
pal,
buddy,
main man,
mate,
oppo,
mucker,
bezzie,
fidus Achates,
Origin:
mid 17th century: alteration of confident (as a noun in the same sense in the early 17th century), probably to represent the pronunciation of French confidente ‘having full trust’.