By oneself, solitary.
Lacking peers who share one's beliefs, experiences, practices, etc.
Not requiring anything further; merely.
By oneself; apart from, or exclusive of, others; solo.
Without outside help.
Used to emphasize the size or extent of something by selecting a subset.
Not permitting anything further; exclusively.
Being the only one of its kind; unequaled, unparalleled or unmatched.
Of a rare quality, unusual.
Of a feature, such that only one holder has it.
Particular, characteristic.
A thing without a like; something unequalled or unparallelled; one of a kind.