Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

WORD ORIGIN

c.1600, from in- (1) "not, opposite of" + distinguishable. Related: Indistinguishably.

MORE RELATED WORDS FOR INDISTINGUISHABILITY

Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.