say it: THAWT-fuhl
thoughtful is an adjective meaning "having intellectual depth". It carries 5 recorded senses.
acting with or showing thought and good sense
“a sensible young man”
taking heed; giving close and thoughtful attention
“heedful of the warnings”
“so heedful a writer”
“heedful of what they were doing”
considerate of the feelings or well-being of others
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for thoughtful come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.