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. Traits can have one or two conflicts with some being added in expansion packs. In the The Sims 3, traits could have up to 2 conflicts, but as of Showtime, there are 7 traits with 3 conflicts: Couch Potato, Dislikes Children, Coward, Cat Person, Dog Person, Equestrian, and Animal Lover. In The Sims 3 for Wii, Easy Going will also conflict with 3 traits. With a young adult, it is possible to have a Sim that conflicts with 12 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
 * Genius
 * Great Kisser
 * Green Thumb
 * Handy
 * Hydrophobic
 * Inappropriate
 * Insane
 * Kleptomaniac
 * Mooch
 * Natural Cook
 * Neurotic
 * Never Nude
 * Over-Emotional
 * Perfectionist
 * Photographer's Eye
 * Social Butterfly
 * Star Quality
 * Vegetarian
 * Vehicle Enthusiast
 * Virtuoso
 * Workaholic

Traits with 1 conflict

 * Absent-Minded (Perceptive)
 * Artistic (Can't Stand Art)
 * Athletic (Couch Potato)
 * Charismatic (Loser)
 * Childish (Dislikes Children)
 * Clumsy (Natural Born Performer)
 * Commitment Issues (Hopeless Romantic)
 * Computer Whiz  (Technophobe)
 * Daredevil (Coward)
 * Disciplined (Couch Potato)
 * Easily Impressed (Snob)
 * Eco-Friendly (Hates the Outdoors)
 * Evil (Good)
 * Excitable (Grumpy)
 * 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)
 * Light Sleeper (Heavy Sleeper)
 * Loner (Party Animal)
 * Loves the Outdoors (Hates the Outdoors)
 * Lucky (Unlucky)
 * Mean Spirited (Friendly)
 * Neat (Slob)
 * No Sense of Humor (Good Sense of Humor)
 * Nurturing (Dislikes Children)
 * Perceptive (Absent-Minded)
 * Rebellious (Schmoozer)
 * Savvy Sculptor (Can't Stand Art)
 * Schmoozer (Rebellious)
 * Slob  (Neat)
 * Snob (Easily Impressed)
 * Unflirty (Flirty)
 * Unlucky (Lucky)

Traits with 2 conflicts

 * Brave (Coward, Loser)
 * Can't Stand Art (Artistic, Savvy Sculptor)
 * Flirty (Unflirty, Shy)
 * Grumpy (Excitable, Hot-Headed)
 * Hates the Outdoors (Loves the Outdoors, Eco-Friendly)
 * Loser (Brave, Charismatic)
 * Natural Born Performer (Coward, Clumsy)
 * Party Animal (Loner, Shy)
 * Shy  (Flirty, Party Animal)
 * Technophobe (Computer Whiz, Couch Potato)

Traits with 3 conflicts

 * Animal Lover (Dog Person, Cat Person, Equestrian)
 * Cat Person (Animal Lover, Dog Person, Equestrian)
 * Couch Potato (Athletic, Technophobe, Disciplined)
 * Coward (Brave, Daredevil, Natural Born Performer)
 * Dislikes Children (Family Oriented, Childish, Nurturing)
 * Dog Person (Animal Lover, Cat Person, Equestrian)
 * Equestrian (Animal Lover, Cat Person, Dog Person)