self-destructive
adjective
UK: /ˌself.dɪˈstrʌk.tɪv/
US: /ˌself.dɪˈstrʌk.tɪv/
Causing harm or destruction to yourself.
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Smoking is a self-destructive habit that's hard to quit.
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His self-destructive behavior led to him losing his job and his family.
Intentionally causing problems that prevent you from being successful.
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The company's policies are self-destructive, hurting long-term growth.
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Engaging in gossip at work is often a self-destructive way to undermine your team.