Diffident or reticent (8)

I believe the answer is:

reserved

I believe this is a double definition.

'diffident' is the first definition.
(similar in meaning)

'reticent' is the second definition.
(synonyms)

(Other definitions for reserved that I've seen before include "Quiet, not given to showing emotion" , "cool" , "Shy; booked" , "Booked - reticent" , "Slow to show emotion" .)

I've seen this clue in The Irish Times.

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