dot tier

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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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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