1. Not exhibiting or characterized by careful thought
   - unreflective, unthinking

See also: thoughtless, unthoughtfulness

• birthright
• birthroot
• birthstone
• birthwort
• birthwort family
• biryani
• bis
• Bisayan
• Bisayas
• Biscayne Bay
• Biscayne National Park
• biscuit
• Biscutalla laevigata
• Biscutella
• bise
• bisect
• bisection
• bisectional
• bisector
• biserial correlation
• biserial correlation coefficient
• biserrate
• bisexual
• bisexual person
• bisexuality