The most popular English dictionary is the Merriam Webster Collegiate Dictionary; this is one of the most comprehensive dictionaries for the English language.
Oxford English Dictionary
The Oxford English Dictionary (OED) is considered the most extensive English dictionary, containing over 600,000 words and tracing their origins and historical usage back over a thousand years. It is a comprehensive resource for understanding the evolution of the English language.
If you mean in the English Language, the Oxford English Dictionary is by far the most comprehensive.
I think you could make the argument that the word "pointless", by definition, is the most pointless word in the English Dictionary.
The & And
Noah Webster, the author of popular readers and spelling books for schools, published his first dictionary, A Compendious Dictionary of the English Language, in 1806.
Robert Cawdrey (A Table Alphabeticall, 1604).Dr.Samuel Johnson, did not, contrary to popular belief, compile the first monolingual English dictionary, though his 1755 Dictionary of the English Language greatly influenced later lexicography.
The Oxford English Dictionary is widely recognized as one of the most comprehensive and authoritative dictionaries in the English language.
Both spellings "quarreling" and "quarrelling" are recognized by the dictionary - the spelling with a single L is the spelling most popular in American English, while the spelling with a double L is most popular in the British English.
Some British dictionaries are: The Oxford English Dictionary The Chambers Dictionary The Collins Dictionary Cassell's English Dictionary
If English Dictionary, the English Dictionary by World Book is great.
Try the Chambers Dictionary (Larousse)