"asqueroso" means disgusting in Spanish, could they have a similar ethimology?
I don't speak Spanish, but according to wiktionary, the answer is no.
- Asqueroso derives from ἐσχάρα, which means hearth in ancient Greek.
- Άσχημος derives from ἀσχήμων, which means ugly or rude in ancient Greek. Ἀσχήμων consists of the privative ἀ and the noun σχῆμα (= shape), so it literally meant something that doesn't have a shape. Σχῆμα derives from the verb ἔχω, and more specifically from its simple past infinitive σχεῖν. The verb ἔχω doesn't seem to be in any way related to ἐσχάρα.
I hope this helps. :-)
Ancient Greek has plenty of accent marks, that don't exist in modern Greek. ~ and ΄ are the most common ancient accent marks, but only the second one survived over the centuries. :-)