stif

Noun

 * 1) A jet, squirt; a stream of fluid or gas
 * 2)  A jet plane; Type of airplane propelled by jet engines instead of propellers

Etymology
From, from. The variant with a short vowel is probably from the comparative.

Adjective

 * 1) Stiff, firm, hard; difficult to move or manipulate.
 * 2) Strong, fixed, hardy well-built; constructed as to last.
 * 3) Having strong resolve; unyielding or strong-minded.
 * 4) Daring, audacious, valiant, boastful.
 * 5) Having great strength, might or ability; mightful.
 * 6) Having great force or potence; forceful.
 * 7) Bloody, injurious, wounding; causing injury or challenge.
 * 8)  Runny; having a high viscosity.
 * 9)  Rough; not smooth to the touch.

Adverb

 * 1) Stiffly, firmly, unmoveably; in a way that is difficult to move or manipulate.
 * 2) With strong resolve; unyieldingly or strong-mindedly.
 * 3) Bloodily, injuriously, woundingly; in a way causing injury or challenge.
 * 4)  Daringly, bravely, forcefully, totally.

Etymology
From.

Adjective

 * 1) Stiff, firm, hard
 * 2) Strong,  fixed