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toxic

adjective (UNPLEASANT)
 
 
/ˈtɒk.sɪk/ US  /ˈtɑːk-/

Definition

informal very unpleasant or unacceptableSerious and unpleasantNot attractive to look atInformal words for badDifficult situations and unpleasant experiencesAccidents and disasters informal causing you a lot of harm and unhappiness over a long period of time: toxic parents a toxic relationshipMaking people sad, shocked and upsetDangerous and harmful
(Definition of toxic adjective (UNPLEASANT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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