ous

callous, fabulous, simultaneous, miscellaneous, extraneous, hilarious, various, precarious, raucous, generous, precious, tremendous, jealous, nervous, tedious, previous, serious, frivolous, delicious, officious, meticulous, ridiculous, insidious, conspicuous, anonymous, obvious, conscious, subconscious, unconscious, semiconscious, humongous, enormous, gorgeous, boisterous, industrious, curious

suffix -ous (possessing the qualities of, full of)
hazardous, glamorous, famous, gracious, spacious miraculous, dangerous, disastrous, anxious, unanimous, tenacious, audacious, spontaneous, advantageous, courageous, contagious, outrageous, voracious, magnanimous, instantaneous, marvelous, cautious, nauseous, strenuous, adventurous, momentous, perilous, credulous, incredulous, infectious, pretentious, conscientious, zealous, infamous, vicious, vigorous, rigorous, grievous, nutritious, continuous (continual vs. continuous), contiguous, ambitious, ambiguous, unambiguous, assiduous, religious, prestigious, superstitious, expeditious, repetitious, suspicious, malicious, capricious, judicious, oblivious, ubiquitous, indigenous, ingenious, mysterious, righteous, prosperous, monotonous, monstrous, pompous, autonomous, innocuous, preposterous, wondrous, ferocious, harmonious, erroneous, glorious, notorious, laborious, poisonous, joyous, luscious, lustrous, luxurious, thunderous, furious, humorous, luminous, ludicrous, scrupulous, unscrupulous, numerous, presumptuous, courteous, discourteous