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Disobliging
Negative Tone
The word carries a negative connotation, suggesting a lack of politeness or kindness. 
Not Interchangeable
'Disobliging' is different from 'disagreeable'; it specifically refers to non-cooperation, not general unpleasantness. 
Context Matters
Use 'disobliging' when someone intentionally does not help, rather than when they can't help. 