“always”

At all times; throughout all time; since the beginning.

A person or thing which is unpleasant, dishonorable, or unwanted tends to appear (or reappear), especially at inopportune times.

Upon failure, it is easier to blame the tools used rather than how they were employed.

Organized, large-scale, armed conflict between countries or between national, ethnic, or other sizeable groups, usually but not always involving active engagement of military forces.

On some occasions, over some periods, or in certain circumstances, but not always.

A murderer will always be discovered.