Solipsism
The theory that the self is the only reality- noun
Sol
Alone
Desolate
Deserted and lonely- adj
Soliloquy
A literary or dramatic speech spoken by a solitary person- noun
Mono
One
Monotonous
Unvarying, lacking in variety- adj
Monosyllabic
Having only one syllable- adj
Monotone
Sameness of sound, style, manner or color- noun
Vulg
Crowd
Divulge
To make public- verb
Vulgar
Of the common people- adj
Poly, poll
Many
Polymath
A person with knowledge of many subjects- noun
Hoi Polloi
The common people, the masses- noun
Polyglot
A person with knowledge of several languages- noun