pertaining to, involving, or suggesting suicide.
tending or leading to suicide.
foolishly or rashly dangerous: He drives at a suicidal speed.

1770–80; suicide + -al1

suicidally, adverb
pseudosuicidal, adjective
unsuicidal, adjective
unsuicidally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
suicidal (ˌsuːɪˈsaɪdəl, ˌsjuː-)
1.  involving, indicating, or tending towards suicide
2.  liable to result in suicide: a suicidal attempt
3.  liable to destroy one's own interests or prospects; dangerously rash

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

suicidal su·i·cid·al (sōō'ĭ-sīd'l)

  1. Of or relating to suicide.

  2. Likely to attempt suicide.

su'i·cid'al·ly adv.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Dolphins are known to hurl themselves up onto beach rocks in a suicidal frenzy
  to escape the mammal-hunting orcas.
Others argue vehemently that it's suicidal not to do so.
We know that people are more suicidal, engage in more domestic violence, and
  tend to drink more during these times.
Describes his subsequent risk-taking suicidal behavior.
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