unthinking

definition: in a thoughtless manner
example:
speech part: adverb
synonyms: thoughtlessly
definition: mentally sluggish
example:
speech part: adjective
synonyms: lumpish lumpen
definition: without care or thought for others
example:
speech part: adjective
synonyms: thoughtless uncaring
definition: not exhibiting or characterized by careful thought
example:
speech part: adjective
synonyms: unreflective unthoughtful

How unthinking is being used?