Antonyms of adj unfamiliar_with

1 sense of unfamiliar with

Sense 1
unacquainted (predicate), unacquainted with (predicate), unfamiliar with (predicate) -- (having little or no knowledge of; "unacquainted with city ways")

INDIRECT (VIA unfamiliar) -> familiar -- (well known or easily recognized; "a familiar figure"; "familiar songs"; "familiar guests")

Similarity of adj unfamiliar_with

1 sense of unfamiliar with

Sense 1
unacquainted (predicate), unacquainted with (predicate), unfamiliar with (predicate) -- (having little or no knowledge of; "unacquainted with city ways")
       => unfamiliar (vs. familiar) -- (not known or well known; "a name unfamiliar to most"; "be alert at night especially in unfamiliar surroundings")