As a mass noun: illusion, unreality; emptiness, vanity; delusion, deception, falsity. Obsolete.

A supposition resting on no solid grounds; a whimsical or visionary notion or speculation.

A fanciful notion; a fancy, a whim.

A supposition resting on no solid grounds; an arbitrary notion.

A whimsical fancy; a perverse conceit; a peculiar notion on some point (usually considered unimportant) held by an individual in opposition to…

A fantastic notion, odd fancy; = whim, n.1 3.

A mental concept of a distinct or vivid kind; an object of mental contemplation, esp. of an attractive or fantastic character; a highly…

A fanciful or impractical idea or theory; a deluded or unrealistic notion. Now somewhat archaic.

= whim, n.1 3.

figurative and allusively. A fanciful notion, a crotchet; a visionary scheme or project. Obsolete.

A worm imagined as infesting the brain. Chiefly figurative. Cf. maggot, n.1 2a, worm, n. 11.

A whimsical, eccentric, strange, or perverse notion or idea. Now archaic and regional.

A fancy or fantastic idea; a foolish brag or boast. Now rare.

A fanciful composition; a conceit. Obsolete.

A fanciful composition. Obs.

A notion or thought that is more or less implausible, indefinite, or fanciful; a vague belief, opinion, or estimate; a supposition, impression, fancy.

A capricious notion or fancy; a fantastic or freakish idea; an odd fancy.

A distaff. Chiefly figurative: a superstition or superstitious piece of proverbial wisdom; esp. in an old woman's rock-staff. Cf. rock, n.2

Anything fanciful or whimsical; a fantastic notion, whim, crotchet; a fanciful ornament, contrivance, etc. Also attributive.

An erratic play of fancy; a fantastic, eccentric, or extravagant idea or notion. (Cf. 2.)

A product of irregular or sportive fancy.

= whim-wham, n. 2. Also attributive.

A twist, eccentric turn, crotchet, conceit.

a piece of whimsicality.