"of or pertaining to extrusion or that which has been extruded," especially in geology, of rock that has been thrust out of the earth by volcanic activity, 1816, from Latin extrus-, past-participle stem of extrudere "thrust out; drive away" (see extrusion) + -ive. Related: Extrusively.

1845, from facilitate + -ive.

"causative, expressive of making or causing," 1813, from Latin factus, past participle of facere "to make, do" (from PIE root *dhe- "to set, put") + -ive.

late 14c., "reproductive, pertaining to propagation," from generate + -ive. Use in linguistics is attested by 1959. Related: Generativity.

"given to hesitation, showing hesitation," 1795, from hesitate + -ive. Related: Hesitatively.

"deceptive, false, illusory," 1670s, from stem of illusion + -ive. The older adjective is illusory.

"tending to illustrate," 1640s, from illustrat-, past-participle stem of Latin illustrare (see illustration) + -ive.

1580s, probably from imitate + -ive; or else from French imitatif, from Late Latin imitativus, from imitat-, stem of Latin imitari "to copy, portray" (from PIE root *aim- "to copy").

"tending to implicate," c. 1600, from implicate + -ive. Related: Implicatively (1570s).

1590s, "capable of being easily impressed" (a sense now rare or obsolete), from impress (v.1) + -ive. Meaning "capable of making an impression on the mind or senses, tending to excite attention and feeling" is from 1775. Related: Impressively; impressiveness.