adj.

1. Marked by or showing lack of due thought or care; careless. See synonyms at careless.
2. Inconsiderate; inattentive: a thoughtless remark.
3. Lacking thought: The debate turned into thoughtless bickering.

thoughtlessly thought'less·ly adv.
thoughtlessness thought'less·ness n.

adjective

1. Lacking or marked by a lack of care: careless, feckless, heedless, inattentive, irresponsible, reckless, unconcerned, unmindful, unthinking. See careful/careless.
2. Devoid of consideration for others' feelings: disregardful, inconsiderate, unthinking, unthoughtful. See careful/careless, courtesy/discourtesy.

adj

Definition: absent-minded, unobservant
Antonyms: attentive, heeding, mindful, observant, thoughtful

adj

Definition: inconsiderate
Antonyms: considerate, kind, thinking, thoughtful, unselfish

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Dansk (Danish)
adj. - tankeløs, ubetænksom, hensynsløs, ubekymret, ligegyldig

Nederlands (Dutch)
zelfzuchtig, onnadenkend

Français (French)
adj. - irréfléchi, sans égards, sans considération

Deutsch (German)
adj. - unüberlegt, leichtsinnig, gedankenlos, rücksichtslos

Ελληνική (Greek)
adj. - απερίσκεπτος, ασυλλόγιστος, επιπόλαιος, απρόσεκτος, αδιάκριτος, χωρίς "τακτ"

Italiano (Italian)
sconsiderato, sbadato

Português (Portuguese)
adj. - inconsiderado (m), estouvado (m)

Русский (Russian)
бездумный, опрометчивый, неосмотрительный

Español (Spanish)
adj. - irreflexivo, desconsiderado, descuidado

Svenska (Swedish)
adj. - tanklös, obetänksam

中文（简体） (Chinese (Simplified))
没有考虑的, 轻率的, 无深虑的

中文（繁體） (Chinese (Traditional))
adj. - 沒有考慮的, 輕率的, 無深慮的

한국어 (Korean)
adj. - 경솔한, 불친절한, 부주의한

日本語 (Japanese)
adj. - 思慮を欠く, 軽率な, 不親切な

العربيه (Arabic)
‏(صفه) طائش‏

עברית (Hebrew)
adj. - ‮חסר-מחשבה, לא מתחשב בזולת, לא זהיר, פזיז, נמהר, אנוכי‬

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