Bruce Willis' daughter, Rumer, has come to her dad's defence against critics who have blasted him for coming across as awkward in interviews, revealing he has partial hearing loss.

The 25-year-old actress has insisted the Die Hard star does not make it his business to be less than talkative when promoting movies and blames a hearing loss issue which has resulted in him struggling to make out what is being said by interviewers.

Rumer, who is Willis' eldest daughter with ex-wife Demi Moore, explains, "I think part of the problem is sometimes he can't hear . . . because he shot a gun off next to his ear when he was doing Die Hard a long time ago, so he has partial hearing loss in his ears.

"If me and my sisters get together and he's at a dinner table and we start talking about fashion and things, the poor guy . . . "

Willis' daughter reckons her dad is under pressure to maintain an edgy and cool guy persona: "I think he just has this vibe where he feels like he's gotta kinda do a cool man (thing)."