thoughtless

American  

[thawt-lis] / ˈθɔt lɪs /

adjective

1. lacking in consideration for others; inconsiderate; tactless.

   a thoughtless remark.

   Synonyms:

   neglectful, negligent

2. characterized by or showing lack of thought: think: thought.

   a shallow, thoughtless book.

3. not thinking enough; careless or heedless.

   thoughtless of his health.

   Synonyms:

   remiss, inattentive

4. devoid of or lacking capacity for thought. think. thought.

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thoughtless British  

/ ˈθɔːtlɪs /

adjective

1. inconsiderate

   a thoughtless remark

2. having or showing lack of thought

   a thoughtless essay

3. unable to think; not having the power of thought

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Other Word Forms

• thoughtlessly adverb
• thoughtlessness noun

Etymology

Origin of thoughtless

First recorded in 1585–95; thought ¹ + -less

Example Sentences

Every so often she had to maneuver around pieces of junk that thoughtless humans had dumped into the ocean—an old DVD player, a sofa and even a toilet.

From Literature

Her volition and intention don’t matter because an artist who is in on the joke makes hating less fun for the thoughtless critic.

From Salon

Back home in Finland, the prime minister said on Monday making such gestures was "thoughtless and stupid" and that the controversy that ensued was "damaging" to the country.

From BBC

Showed courage in the first innings to put a first-Test pair behind him and looked good in the second until a thoughtless shot.

From BBC

A well-chosen pair of socks isn’t a thoughtless gift.

From The Wall Street Journal

Related Words

• careless
• foolish
• ill-advised
• ill-considered
• irrational
• mindless
• reckless
• senseless
• stupid