1. Not exhibiting or characterized by careful thought
   - unreflective, unthoughtful 
2. Without care or thought for others
   - thoughtless, uncaring 
3. Mentally sluggish
   - lumpish, lumpen

1. In a thoughtless manner
   - thoughtlessly, unthinkingly

See also: inconsiderate, stupid, thoughtless

• wonder flower
• wonder woman
• wonder-struck
• wonderberry
• wonderer
• wonderful
• wonderfully
• wonderfulness
• wondering
• wonderingly
• off-key
• off-licence
• off-limits
• off-line
• off-line equipment
• off-line operation
• off-message
• off-peak
• off-piste
• off-putting
• off-ramp
• off-road
• off-roader
• off-season
• off-site