suicidal, dangerous, unsafe, detrimental, self-inflicted, hurtful, mean, prejudicial, injurant, malicious, more...

constructive, productive

self-harm, substance abuse, overeating, procrastination, isolating oneself, compulsive behavior, excessive spending, perfectionism, more...

suicidal thoughts,   harmful to oneself,   acting suicidal,   self detrimental,   self damaging,   shoot in the foot,   self cursed,   dig your own grave,   political suicide,   commiting suicide