Preengaging is a term that implies the start of a process or commitment. Its antonyms would be words that suggest the opposite meaning. Disengaging, for example, would be an antonym of preengaging, conveying the idea of withdrawing or retreating from something. Ignoring is another antonym, as it indicates a lack of engagement or interest. Neglecting is also an antonym, indicating that something is being overlooked or not given due attention. Lastly, avoiding would also be an antonym of preengaging, as it suggests actively steering clear of something. Overall, these antonyms represent a divergence from preengaging - a disinterest or lack of commitment.