For size:
* Petit: This is the most common and general opposite of "large." It means "small."
* Minuscule: This means "tiny" or "minute" and implies something extremely small.
* Exigu: This means "narrow" or "confined" and often refers to a lack of space.
For quantity:
* Peu: This means "little" or "few" and is used for countable nouns.
* Faible: This means "small" or "low" and can refer to quantity or intensity.
For importance:
* Insignifiant: This means "insignificant" or "unimportant."
* Trivial: This means "trivial" or "of little importance."
For scale:
* Petit: Can also be used to express something of a small scale.
* Modeste: This means "modest" or "unpretentious" and can refer to something of a small scale.
The best word to use will depend on the specific context and the nuances you want to express.