Longman Dictionary of Contemporary English homepage

unresponsive

 adjective
     
un‧res‧pon‧sive
not reacting to something or not affected by it
unresponsive to
The disease is totally unresponsive to conventional treatment.
His warning fell on unresponsive ears (=was not listened to).
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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