Familiarly

Adverb

1. With a lack of formality: In a casual or informal manner, as with a close acquaintance; especially when such behavior may be considered inappropriate.

   "He spoke familiarly to the hotel porter."

2. In a casual or informal manner, as with a close acquaintance; especially when such behavior may be considered inappropriate.

   "He spoke familiarly to the hotel porter."

3. In an inappropriately sexual or romantic manner.
4. Colloquially; of common or vernacular speech, as opposed to scholarly language.

   "The giant panda, familiarly known as a "panda bear", is not actually a bear at all."

5. With knowledge or experience: In a manner prompting recognition or recollection.

   "The voice from downstairs sounded familiarly like a foghorn, and right away he knew that Uncle Fred had arrived."