9
peerless(adjective, separate, simple, superior, exceptional)
8
hardly(adverb, smallness)
8
lonesome(adjective, individual, detached, single, alone)
8
odd(adjective, separate, simple, extraordinary, unusual)
8
purely(adverb, smallness)
8
unrivaled(adjective, separate, simple, perfect, exceptional)
7
mere(adjective, utter, absolute)
7
no more than(expression, idiom, adverb, smallness, simply)
7
unparalleled(adjective, perfect, extraordinary, outstanding, individual)
6
at most(expression, idiom, adverb, smallness, simply)
6
entire(property, limited, select, utter, absolute)
5
matchless(adjective, unique, same, unequalled)
5
one and only(expression, adjective, idiom, adverb, separate)
5
solo(adjective, separate, extraordinary, unusual, exceptional)
5
unaccompanied(adjective, separate, individual, detached, private)
5
unequaled(adjective, same)
5
wholly(adverb, just, absolutely, fully, completely)
4
apart(adjective, adverb, individual, unity, solitary)
4
excepting
4
isolated(adjective, separate, simple, special, individual)
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APASmart Define. (2016). only thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/only/thesaurus/synonyms
ChicagoSmart Define. 2016. "only thesaurus" https://smartdefine.org/only/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, only thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/only/thesaurus/synonyms>.
MLASmart Define. "only thesaurus" 1 March 2016. Web. 21 September 2026. <https://smartdefine.org/only/thesaurus/synonyms>