1. (adjective) threatening or foreshadowing evil or tragic developments

• baleful
• forbidding
• menacing
• minacious
• minatory
• sinister
• threatening

2. (adjective) presaging ill fortune

• ill
• inauspicious

1. (adjective) threatening or foreshadowing evil or tragic developments

• alarming

2. (adjective) presaging ill fortune

• unpropitious

1. (adjective) threatening or foreshadowing evil or tragic developments

• balefulness
• maleficence
• mischief
• omen
• portent
• presage
• prodigy
• prognostic
• prognostication

2. (adjective) presaging ill fortune

• inauspiciousness
• unpropitiousness
• omen
• portent
• presage
• prodigy
• prognostic
• prognostication