Select the option that can be used as a one-word substitute for the given group of words.

Having no boundaries or limits

Infinite

The word that can be used as a one-word substitute for "having no boundaries or limits" is infinite.

• Tremendous means very great in size, extent, or degree.
• Infinite means having no limits or boundaries.
• Enormous means extremely large or great.
• Colossal means gigantic or immense.

Infinite is the most appropriate word for the given group of words because it specifically refers to something that has no limits or boundaries. It is derived from the Latin word infinitus, meaning "without end."