(Latin: no, not [ig-, il-, im-, ir-])

(Latin: in, into, within, inside, on, toward [il-, ir-, im-], in, into, etc.: involve, incur, invade; also, used intensively, as in the words inflame and inflammable, or without perceptible force.)

(Old English, Middle English: in, into; within; toward; a prefix used in front of English words, not Latin or Greek elements; as in the words, indoors and inland)

(Latin: in-, "in" + filtratus, "felt")

(Greek: force, strength; seat of strength; muscle, sinew; fibrous vessel in a muscle)