adj. lost
adv. in a lost manner
n. the quality or state of being lost
v. to lose, make or become lost

Alduin sizaan midroti.
Alduin has lost my loyalty.
(Odahviing, 000E16FE)

Bekkhild wahlaan qethsegol ahmulii vahrukt, Eyolf, wen veysun los sizaan ko vul Kest ko Okaaz do Luv.
Bekkhild raised this stone for her husband, Eyolf, whose ship was lost in a dark Tempest in the Sea of Tears.
(Word Wall for Kest, Whirlwind Sprint)

From saan ‘to lose’.

Means 'absent' or 'missing', not 'defeated'. May be an irregular past participle of saan ‘to lose’.