say it: uh-TEN-tiv-nuhs
attentiveness is a noun meaning "paying particular notice (as to children or helpless people)". It carries 3 recorded senses.
paying particular notice (as to children or helpless people)
“his attentiveness to her wishes”
“he spends without heed to the consequences”
the trait of being considerate and thoughtful of others
the trait of being observant and paying attention
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 attentiveness 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.