Imprudently reveals how unpleasant they are (4)

I believe the answer is:

rude

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'unpleasant they are' is the definition.
The answer and definition are different parts of speech. However, adjectives and past participle verbs sometimes mean the same thing.

'imprudently reveals' is the wordplay.
'reveals' indicates the answer is hidden within the clue.
'RUDE' is hidden within 'imprudently'.

'how' is the link.

Can you help me to learn more?

(Other definitions for rude that I've seen before include "Coarse, unpolished" , "Offensive; unpolished" , "discourtesy" , "Discourteous or unrefined" , "Impolite or coarse" .)

I've seen this clue in The Irish Times.

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