Johnny Depp Long-Term Partner ... Amber's a Liar ... He Doesn't Beat Women

Johnny Depp's long-term partner and mother of his 2 children is scoffing at Amber Heard's domestic violence claims ... insisting Johnny is a loving man who has never been physically abusive to women.

TMZ has obtained a letter from Vanessa Paradis, to refute Heard's domestic violence allegations. Paradis, Johnny's partner from 1998 - 2012, calls him "a sensitive, loving and loved person."

Paradis has 2 kids with Depp -- Lily-Rose, 17, and Jack, 14. She calls Heard's claims "outrageous," adding, "In all the years I have known Johnny, he has never been physically abusive with me and this looks nothing like the man I lived with for 14 wonderful years."

Paradis' view of Johnny syncs up with that of his ex-wife Lori Anne Allison, who also said he was never physical with her ... never even screamed.

Heard claims she's the victim of repeated violence, the latest of which was a week ago when she says Johnny smashed an iPhone into her face, bruising her eye. Amber got a temporary restraining order against Depp until a full hearing on the matter can be held next month. Law enforcement sources tell us when cops arrived they saw no evidence of injury.