Diatribe
Challenge, Backbiting, Objection.
Heart-rending
Heartbreaking, Painful, Tragic.
Unprecedented
Remarkable, Matchless.
Inexplicable
Beyond understanding, unaccountable.
Helm
Management, Supervision, Lead.
Demure
Humble, Modest, Shy.
Virulent
Malicious, Toxic.
Jut
Emerge, Supervene.
Articulate
Lucid, comprehensible.
Retrospect
Enquiry, Monitoring of a past event.