Correct Answer: Watery

Solution : The third option is the correct choice.

Viscous describes a substance having a thick and sticky consistency, displaying high resistance to flow, while watery denotes a thin and liquid consistency, characterised by ease of flow.

The meanings of the other options are as follows:

• Grim means unpleasant, stern, or forbidding in appearance or nature.

• Brutal means extremely harsh, cruel, or savage, describing actions or behaviours that involve excessive force or violence.

• Thick means having a relatively great extent from one surface or side to the opposite.

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Therefore, the correct answer is watery.