Enemy is a strong word, and emotions associated with the enemy would include anger, hatred, frustration, envy, jealousy, fear, distrust, and possibly grudging respect.
en.wikipedia.org As one grudging supporter admits, there is much in this book that is disputable.
en.wikipedia.org His grudging fulfillment of this duty, or his creative methods of avoiding it, constitute a recurring subplot, which often serves as the series' comic relief.
en.wikipedia.org Historically, the rivalry's most distinguishing quality had been the grudging respect and appreciation between the two tradition-rich programs.
en.wikipedia.org From the 1980s, however, it was depicted it as an edgy and uneasy one: grudging respect and uneasy friendship due to their vast differences.
en.wikipedia.org