Familiar

adj.calm, kindeveryday

Meaning 1

Known well enough to be recognized without effort.

Reach for it when describing a person, place, sound, or subject that prior contact makes recognizable

A familiar melody helped the nervous singer settle into the rehearsal.

everyday
known
simple prior awareness is all you need to express
not when Known may be too weak when the subject feels comfortably established.
everyday
well-known
many people know the person or subject
not when It can suggest public fame rather than one person's repeated contact.
professional
recognizable
someone can identify the thing on seeing or hearing it
not when Recognizable does not imply the comfort or knowledge that familiarity may bring.
formal
customary
a repeated practice or usual pattern is meant
not when A customary action is habitual, not necessarily recognizable.

Comfortably informal in a way that assumes personal closeness.

Reach for it when describing an easy manner between people who know one another

Their familiar banter made the long setup feel shorter.

everyday
casual
the manner is relaxed and unceremonious
not when Casual may suggest carelessness, which familiar does not.
warm
easygoing
the atmosphere is relaxed and low-pressure
not when It describes temperament more than a relationship built through acquaintance.
professional
informal
relaxed conventions distinguish the interaction
not when Informal can describe style between strangers and says nothing about closeness.
literary
companionable
comfortable friendliness between people is the appeal
not when Companionable is warmer than familiar and may overstate affection.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.