ADJ. careful, close, detailed | direct | systematic | casual | empirical, scientific | clinical | astronomical
PREP. for ~ She was admitted to hospital for observation. | under ~ The police have had him under observation for several weeks. | ~ of The survey was based on direct observation of over 500 schools.
PHRASES powers of observation an artist with acute powers of observation
ADJ. general | astute, keen, shrewd | interesting
VERB + OBSERVATION make
PREP. ~ about He smiled, and made some observation about the weather. | ~ on her witty observations on life