1. Without proper consideration or reflection
   "unconsidered words"; "prejudice is the holding of unconsidered opinions"
   - inconsiderate

See also: thoughtless

• genus Acropora
• genus Acrostichum
• genus Actaea
• genus Actias
• genus Actinia
• genus Actinidia
• genus Actiniopteris
• genus Actinomeris
• genus Actinomyces
• genus Actitis
• genus Adalia
• genus Adansonia
• genus Addax
• genus Adelges
• genus Adenanthera
• genus Adenium
• genus Adenota
• genus Adiantum
• genus Adlumia
• genus Adonis
• genus Aedes
• genus Aegiceras
• genus Aegilops
• genus Aegypius
• genus Aegyptopithecus