Intrigued at ungratefulness (11)

I believe the answer is:

ingratitude

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'ungratefulness' is the definition.
(synonyms)

'intrigued at' is the wordplay.
'intrigued at' anagrams to 'INGRATITUDE'.
But, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for ingratitude that I've seen before include "Inappreciativeness" , "Lack of appreciation" , "Lack of thankfulness" , "Thanklessness" , "base behaviour" .)

I've seen this clue in The Irish News.

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