severe

a.严重的；严厉的；激烈的，困难的

settle for sth, settle on sth, settle one's account, settled, settlement, settler, seven, seven-, seven-course, seventeen, seventeenth, seventh, seventieth, seventy, seventy-eight, sever, several, severally, severance, severance pay, severely, severity, sew, sewage, sewage farm, sewage works, sewer, sewerage, sewing, sewing-machine, sewn, sex, sex act, sex appeal, sex life, sex-, sex-starved, sexagenarian, sexily, sexiness,