Trait conflict

Trait conflict is a situtation where a trait can't be chosen due to presence of particular traits, such as Evil conflicting with Good. A trait can have up to four conflicts at a time, with some being added in expansion packs. In the The Sims 3, traits could have 4 conflicts at most as of Supernatural. In The Sims 3 for Wii, Easy Going will also conflict with 3 traits. This article contains a list of trait conflicts.

The Sims 3 and The Sims 3 (console)
If an incompatible trait is learned, relationship will be decreased slightly. Using a social whose trait prevents the social from working, for example a joke about work on a Workaholic or "Talk about Computers" on a Technophobe, will learn the trait and may decrease the relationship if that trait has a conflict. Observant Lifetime Reward can cause conflicting traits to be learned when the Sim starts to socialize with that Sim. Vampires' ability to read mind makes them to learn conflicting traits faster.

If a Sim has more than one trait that both result in a conflict and share traits as well, both positive and negative interactions will occur.

The Sims Medieval
Relationship is no longer decreased when an incompatible trait is learned. In addition, learning the shared trait will no longer increase relationship. Social effectiveness from traits are same as The Sims 3.

List of traits with conflicts
Note: All traits listed here apply only to Windows and Mac OS X. This also applies roughly to console version if exists.

Traits with no conflicts

 * Adventurous
 * Ambitious
 * Angler
 * Bookworm
 * Born Salesperson
 * Diva
 * Dramatic
 * Eccentric
 * Frugal
 * Gatherer
 * Genius
 * Great Kisser
 * Green Thumb
 * Handy
 * Insane
 * Irresistible
 * Kleptomaniac
 * Loves the Cold
 * Loves the Heat
 * Mooch
 * Natural Cook
 * Neurotic
 * Never Nude
 * Night Owl
 * Over-Emotional
 * Perfectionist
 * Photographer's Eye
 * Star Quality
 * Unstable
 * Vegetarian
 * Vehicle Enthusiast
 * Virtuoso
 * Workaholic

Traits with 1 conflict

 * Absent-Minded (Perceptive)
 * Artistic (Can't Stand Art)
 * Athletic (Couch Potato)
 * Bot Fan (Technophobe)
 * Brooding (Excitable)
 * Childish (Dislikes Children)
 * Clumsy (Natural Born Performer)
 * Commitment Issues (Hopeless Romantic)
 * Computer Whiz (Technophobe)
 * Daredevil (Coward)
 * Disciplined (Couch Potato)
 * Eco-Friendly (Hates the Outdoors)
 * Evil (Good)
 * Family-Oriented (Dislikes Children)
 * Friendly (Mean Spirited)
 * Good (Evil)
 * Good Sense of Humor (No Sense of Humor)
 * Heavy Sleeper (Light Sleeper)
 * Hopeless Romantic (Commitment Issues)
 * Hot-Headed (Grumpy)
 * Hydrophobic (Loves To Swim)
 * Inappropriate (Proper)
 * Light Sleeper (Heavy Sleeper)
 * Loves the Outdoors (Hates the Outdoors)
 * Loves To Swim (Hydrophobic)
 * Lucky (Unlucky)
 * Mean Spirited (Friendly)
 * Neat (Slob)
 * No Sense of Humor (Good Sense of Humor)
 * Nurturing (Dislikes Children)
 * Perceptive (Absent-Minded)
 * Rebellious (Schmoozer)
 * Sailor (Hates the Outdoors)
 * Savvy Sculptor (Can't Stand Art)
 * Schmoozer (Rebellious)
 * Snob (Easily Impressed)
 * Socially Awkward (Charismatic)
 * Supernatural Skeptic (Supernatural Fan)
 * Unflirty (Flirty)
 * Unlucky (Lucky)

Traits with 2 conflicts

 * Avant Garde [TS3: UL](Can't Stand Art, Easily Impressed)
 * Brave (Coward, Loser)
 * Charismatic (Loser, Socially Awkward)
 * Easily Impressed (Snob, Avant Garde)
 * Excitable (Grumpy, Brooding)
 * Flirty (Unflirty, Shy)
 * Grumpy (Excitable, Hot-Headed)
 * Loner (Party Animal, Social Butterfly)
 * Loser (Brave, Charismatic)
 * Natural Born Performer (Coward, Clumsy)
 * Party Animal (Loner, Shy)
 * Proper (Slob, Inappropriate)
 * Slob (Neat, Proper)
 * Social Butterfly (Loner, Shy)
 * Supernatural Fan (Coward, Supernatural Skeptic)

Traits with 3 conflicts

 * Animal Lover (Dog Person, Cat Person, Equestrian)
 * Can't Stand Art (Artistic, Savvy Sculptor, Avant Garde)
 * Cat Person (Animal Lover, Dog Person, Equestrian)
 * Couch Potato (Athletic, Technophobe, Disciplined)
 * Dislikes Children (Family Oriented, Childish, Nurturing)
 * Dog Person (Animal Lover, Cat Person, Equestrian)
 * Equestrian (Animal Lover, Cat Person, Dog Person)
 * Hates the Outdoors (Loves the Outdoors, Eco-Friendly, Sailor)
 * Shy (Flirty, Party Animal, Social Butterfly)
 * Technophobe (Computer Whiz, Couch Potato, Bot Fan)

Traits with 4 conflicts

 * Coward (Brave, Daredevil, Natural Born Performer, Supernatural Fan)