dotty

1 [dot-ee]
adjective, dottier, dottiest. Informal.
1.
crazy or eccentric.
2.
feeble or unsteady in gait.
3.
very enthusiastic or infatuated (usually followed by about or over ).

Origin:
1805–15; perhaps dott(ard) variant of dotard + -y1

dottily, adverb
dottiness, noun
Dictionary.com Unabridged

dotty

2 [dot-ee]
adjective, dottier, dottiest.
marked with dots; dotted.

Origin:
1805–15; dot1 + -y1

dottiness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dotty (ˈdɒtɪ)
 
adj , -tier, -tiest
1.  slang chiefly (Brit) feeble-minded; slightly crazy
2.  slang (Brit) (foll by about) extremely fond (of)
3.  marked with dots
 
[C19: from dot1: sense development of 1 from meaning of "unsteady on one's feet"]
 
'dottily
 
adv
 
'dottiness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

dotty
1812, full of dots, from dot + -y (2). Meaning silly is from c.1400, in dotypolle dotty poll (i.e. dotty head), in which case the first element is from dote (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But when the movie focuses on plot and character, it turns quite dotty in an amiable way.
While their meandering, dotty conversation is endearing and enlightening, following along is an exercise in stamina.
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