Final answer:
The most significant complication associated with incorrect use of medical terminology is that ineffective treatment could be rendered.
Step-by-step explanation:
The MOST significant complication associated with incorrect use of medical terminology is that ineffective treatment could be rendered. When medical terminology is used incorrectly, it can lead to misunderstandings and miscommunication among healthcare professionals. This can result in errors in diagnosis, treatment, and medication administration, ultimately leading to ineffective treatment and potentially harmful outcomes for the patient.