Tending to cause disturbance; having the quality or effect of disturbing.
From disturbance + -ive suffix (from Latin -ivus), meaning 'tending to' or 'characterized by.' This follows the standard English pattern of creating adjectives from action nouns.
The -ative suffix is incredibly productive in English: one small thing can be 'disturbative,' but if you add it to 'navigate' you get 'navigative'—these descriptors of tendency are everywhere in technical writing.
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