penchant (n.)

• affinity
• aptitude
• aptness
• bent
• bias
• cast
• delight
• diathesis
• disposition
• eagerness
• fancy
• fascination
• favor
• fondness
• inclination
• inclining
• leaning
• liability
• liking
• partiality
• predilection
• predisposition
• preference
• prejudice
• probability
• proclivity
• proneness
• propensity
• readiness
• susceptibility
• sympathy
• taste
• tendency
• tropism
• turn
• twist
• warp
• weakness
• willingness