serenely

adv: He seemed serenely unaware that anything had gone wrong. 他神色平静, 似乎并不知道已出事了.

sepulchre (US sepulcher), sequel, sequela, sequence, sequence of tenses, sequential, sequentially, sequester, sequestered, sequestrate, sequestration, sequin, sequoia, seraglio, seraph, seraphic, sere, serenade, serendipity, serene, serenity, serf, serfdom, serge, sergeant, sergeant-major, Sergt (also Sgt), serial, serial number, serialization, serialisation, serialize, serialise, serially, seriatim, series, serif, serio-comic, serious, seriously, seriousness, serjeant-at-arms,