... speech⇒speechless: không nói rest⇒ restless: không nghỉ ngơi childl ⇒ childless: không con cái odour ⇒ odourless: không mùi care ⇒ careless: bất cẩn harm ⇒ harmless: không có hại tree ⇒ treeless: không có ... national, industrial, agricultural, cultural, magical… -ous Dangerous, courageous, poisonous, mountainous… -ic Artistic, electric, electronic, alcoholic, economic… -able Respectable, knowledgeable, ... yearly,friendly… -like Childlike, godlike, lifelike, ladylike, manlike… -y Healthy, dirty, dusty, snowy, windy, rainy, cloudy, sunny, sandy… -ish Childish, boyish, girlish, mannish, selfish… -al Natural,...