callow

adj. （鸟）未生羽毛的，（人）未成熟的

call sth forth, call the roll, call up, call-box, call-girl, call-in, call-up, call...to account, caller, calligrapher, calligraphy, calling, calling-card, calliper (also caliper), callisthenics (also calisthenics), callosity, callous, calloused, callously, callousness, callowness, callus, calm, calm down, calmly, calmness, Calor gas, calorie, calories, calorific, calorimeter, calory, calumniate, calumnious, calumny, calve, calves, Calvinism, Calvinist, calypso,