1. Filled with bewilderment
   "at a loss to understand those remarks"
   - nonplused, nonplussed, puzzled

1. Below cost
   "sold the car at a loss"

See also: perplexed

• half page
• half pound
• half rest
• half sister
• half snipe
• half sole
• half step
• half title
• half track
• half volley
• half-and-half
• half-and-half dressing
• half-arsed
• half-assed
• half-baked
• half-blooded
• half-bound
• half-bred
• half-breed
• half-caste
• half-century
• half-clothed
• half-cock
• half-crazed
• half-dozen