English word thoughtless comes from English -less (Lacking (something); without (something).), English thought
| Dictionary entry | Language | Definition |
|---|---|---|
| -less | English (eng) | Lacking (something); without (something). |
| thought | English (eng) | (uncountable) The process by which such forms arise or are manipulated; thinking.. A way of thinking (associated with a group, nation or region).. Form created in the mind, rather than the forms perceived through the five senses; an instance of thinking. |
| thoughtless | English (eng) | Inconsiderate, inattentive.. Lacking thought or consideration.. Marked by or showing lack of due thought or care; careless. |