- apprehension
- bee
- boutade
- brainstorm
- capriccio
- caprice
- conceit
- concept
- conception
- consideration
- crank
- craze
- crazy idea
- crotchet
- delirium
- drive
- eagerness
- estimate
- fad
- fancy
- fantasticism
- fantastic notion
- fantasy
- fleeting impulse
- flight of fancy
- flimflam
- fool notion
- freak
- freakish inspiration
- fumes of fancy
- harebrained idea
- horme
- humor
- idea
- idle fancy
- image
- imagination
- imaginativeness
- imagining
- imago
- impression
- inspiration
- intellection
- intellectual object
- kink
- lights
- maggot
- megrim
- memory-trace
- mental image
- mental impression
- mind
- natural impulse
- need
- notion
- observation
- opinion
- passing fancy
- perception
- phantasm
- pleasure principle
- popular belief
- quick hunch
- quirk
- recept
- reflection
- representation
- sentiment
- supposition
- theory
- thought
- toy
- urge
- vagary
- vaunting
- want
- wanting
- way of thinking
- whim
- whimsy
- whim-wham
- will and pleasure
- wish