Whole-hog is a colloquial word used to describe doing something completely or thoroughly. Antonyms for whole-hog would be words or phrases that imply doing things sparingly or partially. Some antonyms could include "half-hearted," "halfway," "incomplete," "partial," "fragmented," or "piecemeal." For example, instead of going whole-hog on a project, one could approach it piecemeal and break it down into smaller, more manageable tasks. Similarly, instead of committing completely to a new diet or exercise program, one could take a more partial approach and make small changes over time. Antonyms for whole-hog can certainly be useful when a more measured approach is desired.