One who has fanciful ideas or notions.

One who has fanciful ideas or indulges in wild notions. Obs. exc. arch.

a person with silly or eccentric notions; = maggot-pate n. at maggot, n.1 compounds 2.

One who does not keep within ordinary or reasonable limits; an exceptional or eccentric person; a fanatic. Obsolete.

A fanatic person; a visionary; an unreasoning enthusiast. Applied in the latter half of the 17th c. to Nonconformists as a hostile epithet.

Originally: an adherent of a Christian sect regarded as heretical, esp. one who claims prophetic inspiration or divine ecstasy (now rare). Now more…

A person who acts in an original way; a singular, odd, or eccentric person.

a person with a head full of odd fancies or frivolities (cf. toy-headed adj.).

A queer-looking figure, an oddity; dialect a fool. Chiefly Eton College slang. Cf. geck, n.1, gegge, n.

An odd or eccentric person; a person whose appearance is peculiar or ridiculous.

An odd or ridiculous person or thing; (with plural agreement) people or things of this kind. Also as int.: expressing incredulity or contempt. Cf…

an odd, dubious, or suspect person.

A person with a crotchet; esp. one who pushes or obtrudes his crotchets in politics, etc.

figurative. English regional (north-western). A peculiar, eccentric, or disorderly person; (in weakened sense) a person, esp. a man. Usually derog…

A person whose conduct is irregular, odd, or whimsical.

slang. In extended uses of senses 7 8. U.S. An eccentric or comical person; a ‘character’.

A person who acts, thinks, or otherwise behaves in an original way. Now rare.

An odd or eccentric person; a funny fellow.

one who has crotchets on political and other questions and obtrusively advocates them; hence crotchet-mongering.

Applied to a person who is ‘queer’ in his appearance, habits, etc.; cf. oddity, n.

colloquial (originally U.S.). A person with a mental twist; one who is apt to take up eccentric notions or impracticable projects; esp. one who is…

A crack-brain, a crazy creature, a crank. Also attributive.

One who has a fad; one who indulges in fads.

(feminine.)

Australian and New Zealand. An amusing or eccentric person, a ‘character’; typically (esp. in early use) one who is tough and adventurous. Cf. doer…

Originally and chiefly Criminals' slang (chiefly North American). A (uniformed) police officer; (also) a prison officer. Now rare.

a highly eccentric or crazy character (frequently in mad hatter's tea party).

colloquial (originally U.S.). A mad or crazy person; an eccentric, a crank.

= number, n. (in various senses). Also: an eccentric or strange person.

colloquial (originally U.S.). A crazy or eccentric person; a madman; an oddball. Frequently as a mild term of abuse.

An eccentric or crazy person; a madman, a crackpot.

colloquial (originally U.S.). A mad, crazy, or eccentric person.

a person who is odd, strange, or eccentric.

An eccentric or odd person; a person of unconventional views or habits. Cf. screwball, n. 2.

A large and extremely light sail used when there is very little wind.

colloquial. A passionate enthusiast for something; a fanatic. Now rare.

A cranky, crazy, or eccentric person. Frequently attributive or as adj.

One who is ‘flaky’ or liable to act in an eccentric or crazy manner, a ‘screwball’; also, a foolish, slow-witted, or unreliable person. slang…

A person who holds beliefs or follows practices regarded as unscientific, irrational, or outlandish, esp. ones relating to spirituality, mysticism…

Odd, weird, ‘freaky’. Hence as n., a person in this state.

= wack, n.1

British colloquial. Politics. A person with uncompromising or extreme political views; a hardliner, esp. (depreciative) one regarded as fanatical…