truly · adverb /ˈtruː.li/Full view
Nouns: truism, truth, untruth, truthfulness
Adjectives: true, untrue, truthful
Adverbs: truly, truthfully
truly (VERY)
B2 used to emphasize a description of something
Dictionary examples:

This is a truly remarkable achievement.

It was a truly terrifying experience.

Learner example:

Those concerts are truly eye-opening. (First Certificate in English; B2; Chinese)

truly (SINCERELY)
C1 used to emphasize that something is sincere or honest
Dictionary examples:

Truly I could not have done this without you.

He truly believes he can cure himself by willpower alone.

Learner example:

It would probably take years to achieve it but in the long run I truly believe it would work, as long as everyone is willing to [make] an effort. (Certificate in Advanced English; C1; Danish)

Yours truly,
B1 used to end a letter
Dictionary example:

I look forward to hearing from you. Yours truly, Taylor Champinski.

Learner example:

Dear Clyde, . . . I hope my advice helps you [with] your decision. Yours truly, (Preliminary English Test; B1; Spanish)

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