einzig

Adjective

 * 1) only, sole
 * 2) unique

Usage notes

 * When followed by another adjective, einzig is typically used in the bare form: die einzig richtige Antwort ("the only correct answer"). However, it is just as correct to follow the general practice and decline both: die einzige richtige Antwort.
 * Colloquially, an intensified form (formally a superlative) is sometimes heard. This is non-standard usage.

Adverb

 * 1) only