Explanation:

- Dedicated usually refers to someone who is devoted or committed to a task or purpose.

- Option 1: Dreary means dull, bleak, and lifeless. It's often used to describe something uninteresting or gloomy.

- Option 2: Boring indicates something that lacks interest or excitement. It's not about devotion or commitment.

- Option 3: Tedious refers to something that is repetitive or monotonous, making it tiresome. It's not related to being dedicated.

- Option 4: Committed is a direct synonym for dedicated as both describe someone who is devoted or devoted to a cause or activity.

Option 4: Committed is the most appropriate synonym for dedicated.

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