Imagined getting not quite so inconsiderate (11)

I believe the answer is:

thoughtless

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'quite so inconsiderate' is the definition.
'thoughtless' can be an answer for 'inconsiderate' (similar in meaning). I'm not sure about the 'quite so' bit.

'imagined getting not' is the wordplay.
'imagined' becomes 'thought' (thinking is a kind of imagining).
'getting' is a charade indicator (letters next to each other).
'not' becomes 'less' (I've seen this in other clues).
'thought'+'less'='THOUGHTLESS'

Can you help me to learn more?

(Other definitions for thoughtless that I've seen before include "Showing little consideration for others" , "Uncaring" , "Insensitive" , "Lacking consideration" , "Inconsiderate - reckless" .)

I've seen this clue in The Daily Express.

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