Step 1: Understanding 'Inevitable'.
'Inevitable' means something that cannot be avoided or prevented. The antonym would refer to something that can be avoided.
Step 2: Analysis of options.
- Avoidable: This is the correct antonym of 'inevitable', as it refers to something that can be prevented or avoided.
- Unnecessary: This doesn't directly oppose 'inevitable', as 'unnecessary' refers to something not needed, but not in relation to inevitability.
- Inseparable: This doesn't relate to 'inevitable' in terms of meaning.
- Uncertain: This means something is not certain or known, but not the opposite of inevitable.
Step 3: Conclusion.
The correct antonym of 'inevitable' is Avoidable.