säker

Etymology
From, from , from , from.

Adjective

 * 1) safe
 * 2) secure
 * 3) sure, certain
 * 4) sure, secure (reliable, non-failing)
 * 5) reliable, trustworthy
 * 1) sure, secure (reliable, non-failing)
 * 2) reliable, trustworthy
 * 1) reliable, trustworthy
 * 1) reliable, trustworthy
 * 1) reliable, trustworthy

Usage notes
See also the adverb, which doesn't imply certainty.