Singular

enig

(being the only one of a kind)

enige

(being the only one of a kind)

enkelvoudig

(grammar: referring to only one thing)

enkelvoudige

(grammar: referring to only one thing)

ongewoon

(being out of the ordinary)

opmerkelijk

(distinguished by superiority)

opmerkelijke

(distinguished by superiority)

singulier

(linear algebra: of matrix: having no inverse)

uitzonderlijk

(distinguished by superiority)

enkelvoud

(grammar: form of a word that refers to only one thing)