Most favorite and least favorite are both commonly used by native speakers. The way favorite and unique are used by people who have better things to do than worry about the minutiae of grammar is closer to a hyperbole than a logical statement about something.
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I've recently come across a novel called A most wanted man, after which being curious I found a TV episode called A most unusual camera. Could someone shed some light on how to use "a most" and wh...
superlative degree - How/when does one use "a most"? - English Language ...
Most is what is called a determiner. A determiner is "a word, such as a number, article, personal pronoun, that determines (limits) the meaning of a noun phrase." Some determiners can only be used with either a countable noun or an uncountable noun, while others, like most, can be used with both countable and uncountable nouns. Uncountable nouns usually take a singular verb. So, in your ...
A thing I have never had the time to look more closely into. But I find both variants: What I love most is ... or What I love the most is ... I think the more common form is 'the most', and I ...
adverbs - Which is more common - 'the most' or 'most'? - English ...
The adverbial use of the definite noun the most synonymous with the bare-adverbial most to modify an entire clause or predicate has been in use since at least the 1500s and is an integral part of English.