冥思苦索

to mull over (idiom) / to think long and hard

old variant of 冥[ming2]

dark / deep / stupid / the underworld

to think / to consider

bitter / hardship / pain / to suffer / to bring suffering to / painstakingly

surname Suo / abbr. for 索馬里|索马里[Suo3 ma3 li3], Somalia

to search / to demand / to ask / to exact / large rope / isolated