The antonyms for custom made include ready-made, off-the-shelf, mass-produced, generic, and standardized. Ready-made describes products that are already manufactured and readily available for purchase. Off-the-shelf items are pre-manufactured and can be purchased without the need for personal customization. Mass-produced items are made in large quantities, with little to no attention paid to individual requests. Generic items lack unique features or customization options. Standardized items are produced to a uniform standard, with little variation. While custom-made items are tailored to the individual, their antonyms are related to standardized, mass-produced, and generic products that lack the same level of personalization.