attentive

Word family

• attend
  verbA2
• attention
  nounA2
• attentively
  adverbB2
• attentiveness
  nounC1
• inattentive
  adjectiveC1

Synonym discussion

Sense: adjective/1

All four words describe someone whose mind is fully engaged with what is happening, but they differ in flavour. 'Attentive' suggests sustained, willing focus — a student listening to a teacher, a reader following a long argument. 'Alert' is shorter and sharper: ready to react quickly to a sudden change, like a driver on a foggy road. 'Observant' highlights noticing small visual or behavioural details that others miss, often without trying. 'Vigilant' is the most serious of the four; it suggests guarding against danger over a long period, like a security guard on night duty. So you can be an attentive listener at a lecture, an alert driver in heavy rain, an observant detective at a crime scene, and a vigilant parent near a busy road.

Common collocations

Etymology

Comes from the Latin verb 'attendere', meaning 'to stretch one's mind toward something' (formed from 'ad-' meaning 'toward' and 'tendere' meaning 'to stretch'). The word entered English through Old French 'attentif' in the late 14th century, first describing focused attention and only later extending to the warmer sense of caring action toward another person.