Diphthongy

This ghost is the only other person besides Neyeurme who can say it correctly because it has all these diphthongy tongue-strangling nuances to it.

Source: wiktionary

American vowels tend to be very impure and diphthongy; you do NOT want this sound in your Italian or Latin.

Source: wiktionary

You could see Oliver brightening up at the sight of that æ. He – keen on diphthongy things – really liked words with ligatures. Julius Cæsar!

Source: wiktionary

I thought it was a sort of weird diphthongy vowel, almost like the French "dure" (hard) crossed with "do-er" -- very distinctive in a hard-to-pin-down way.

Source: wiktionary