1 [+ adjective/adverb]
used to emphasize that the way you are describing something is really true [= really]:
His work is truly original.
Fawcett was a truly remarkable man.
a truly great work of medieval literature
I am truly sorry.
She truly believed he was innocent.
I can truly say I've never enjoyed myself so much.
in an exact or correct way:
Is it a truly representative sample?
4 especially spoken
We were well and truly beaten.
The party was well and truly over.
5 British English spoken
used to emphasize that something is definitely or completely true:
I couldn't believe we were really and truly going at last.
used at the end of a letter, before the signature
used humorously to mean yourself:
So, yours truly was left to clean up.