1. Causing fear or dread or terror
   - awful, dire, direful, dread, dreaded, dreadful, fearful, frightening, horrendous, horrific, terrible

See also: alarming, fearsomely

• intoxicate
• intoxicated
• intoxicating
• intoxication
• intra vires
• intra-
• intrabronchial
• intracapsular surgery
• intracellular
• intracellular fluid
• intracerebral
• intracranial
• intracranial aneurysm
• intracranial cavity
• intractability
• intractable
• intractableness
• intractably
• intracutaneous
• intradepartmental
• intradermal
• intradermal injection
• intradermal test
• intradermally
• intradermic