The first two words are often given an extra syllable when spoken, but they don’t merit it. It’s not GREE-vee-us, nor is it mis-CHEE-vee-us.
They are pronounced GREE-viss and MIS-chiv-iss.
As to the third mispronunciation: the word is homo-JEEN-ee-iss, not huh-MOJ-en-iss. The latter seems to be the affected person’s choice. Instead of adding a syllable, as in the first two words, many people are dropping a syllable in homogeneous.
Thank you for your attention and consideration of my suggestions.