Less quality synonym
For something with less quality than another item, lower quality is usually the more natural phrase. Depending on your meaning, alternatives include inferior, substandard, poorly made, or less reliable. The right replacement identifies the actual weakness rather than simply sounding more negative.
Start with the comparison
Use lower quality when comparing the overall standard of two things: The replacement paper is lower quality than the original. Before a noun, the phrase commonly takes a hyphen: lower-quality paper. The comparative wording makes clear that you are judging one option against another rather than declaring that every part of it is unusable.
Inferior for a broad comparison
Inferior can describe something judged worse than a competing option. It is a strong, broad evaluation, so explain the comparison when it matters. In an original example, The copy has inferior print quality identifies the feature being criticized. Simply calling a product inferior leaves the reader to guess what failed.

Substandard for a missed standard
Substandard suggests that something falls below an expected or required standard. Use it when there is a meaningful benchmark, such as a specification, a stated requirement, or an established level of work. If you cannot name the standard, a concrete description may be fairer and more informative.
Poorly made for construction problems
Poorly made points toward workmanship or construction. It can fit loose seams, misaligned parts, or an uneven finish. It is less suitable for a product that is well constructed but lacks a feature you wanted. Describe the observable defect so the criticism can be understood and checked.
Less reliable for inconsistent performance
Less reliable focuses on dependability. A device may have an attractive finish yet fail more often than another device. A source may look professional yet provide inconsistent information. Reliability is one aspect of quality, so do not substitute less reliable when your complaint is only about appearance or style.
Cheap is not the same as low quality
Cheap can refer to a low price, and readers may also hear a criticism of quality. That ambiguity makes it a poor replacement when you mean only affordable. Use inexpensive or low-cost for price. Use a description such as thin material, uneven stitching, or unclear audio for the specific quality concern.
A practical editing method
Replace less quality with lower quality first, then ask what evidence supports the comparison. If the answer is about sound, write muffled audio or more background noise. If it is about a photograph, write lower resolution or visible blur where accurate. Specific wording helps readers decide whether the weakness matters to them.
More language help: Word meanings and writing guides