unavoidable (adj.)

• certain
• definite
• destined
• determined
• fated
• fateful
• fixed
• indefeasible
• ineluctable
• inescapable
• inevitable
• inexorable
• inflexible
• irresistible
• irrevocable
• necessary
• predestined
• predetermined
• relentless
• resistless
• settled
• sure
• unalterable
• unchangeable
• uncontrollable
• unpreventable
• unstoppable
• unyielding