it sounds like you're grappling with a truly profound sense of repulsion towards parasites, and you're seeking to articulate that intense feeling with a more robust lexicon. Let's delve into some words that can help you express this visceral abhorrence:
The creatures you describe, these parasitic organisms, are loathsome, utterly abominable, and profoundly detestable. They are nothing short of repugnant and revolting. One might even characterize them as vile, foul, or execrable. The very essence of their existence is sickening, and contemplating their insidious nature evokes a profound sense of nausea and revulsion. They are truly ungodly, an affront to all that is naturally pure and wholesome.
Their modus operandi, their parasitic relationship, is fundamentally based on exploiting and depleting the vitality of their hosts. This one-sided dynamic, where one creature thrives at the expense of another, can be described as exploitative and inherently antagonistic. The very thought of these organisms preying upon and diminishing the essence of other life forms is sufficient to induce intense disgust and abhorrence.
**I told AI to make it wordy and fancy, lol