Or search: dispiriting, discouraging, demoralising, disheartening
3 Syllables: SUU
realising, realizing
4 Syllables: SUUU
analyzing, civilizing, equalizing, fertilizing, generalizing, glorifying, horrifying, mobilizing, moralizing, neutralizing, notifying, paralyzing, specializing, stabilizing, symbolizing, tantalizing, utilizing

Found 19 words across 2 groupings.