lost adj.
1 unable to find the way
VERBS be | get We got lost in the woods.
ADV. completely By this time we were completely lost.
2 not knowing what to do
VERBS be, feel, look, seem I felt lost without my watch.
ADV. completely, totally Alina was looking totally lost. | very | a bit, a little, rather She looked rather lost and lonely, standing in a corner by herself.
You can also check other dicts: lost (English, 中文解释 ), wordnet sense, Collins Definition