Select the most appropriate antonym of the given word.

Fluctuate

Stabilize

The most appropriate antonym of the word fluctuate is stabilize.

• Fluctuate means "to change or vary irregularly or unpredictably."
• Stabilize means "to make or become stable or constant."

The other words do not have the same meaning as fluctuate, so they are not its antonyms.

• Mobilize means "to organize and prepare (troops or other resources) for war or other conflict."
• Waver means "to move or sway unsteadily or hesitantly."
• Stumble means "to walk unsteadily or uncertainly."