Step 1: Understand the word.
Transcendent means surpassing all others, beyond ordinary limits, supreme or extraordinary.
Step 2: Look for the opposite meaning.
If transcendent means beyond the ordinary, its antonym must refer to something within ordinary limits.
Step 3: Eliminate and confirm.
Unparallel, remarkable, and supreme are all close in meaning to transcendent. Only ordinary captures the opposite - something average, not surpassing anything.
\[ \boxed{\text{ordinary}} \]