Word: thoughtless
Part of speech: Adjective
Syllables: thought
less
Definition: Marked by or showing lack of due thought or care; careless.
Morphemes:
Affix: thought
Language: en
PoS: Verb
Meaning: Simple past tense and past participle of think; ponder; reflect on, or reason about
Affix: -less
Language: en
PoS: Suffix
Meaning: Lacking (something); without (something). Added usually to a noun to form an adjective signifying a lack of that noun.