Inscribe. Write, engrave, impress, imprint; address, dedicate; label, letter, mark, delineate.
Ant. Erase, efface, cancel, expunge, obliterate.
Inscrutable. Incomprehensible, unsearchable, impenetrable, unintelligible, hidden, mysterious, untraceable, insolvable, profound.
Ant. Obvious, intelligible, explainable, self-evident, familiar.
Insert. Set in, place in, introduce.
Ant. Exclude, follow, add.
Inside. Within, internally.
Ant. Without, outside, externally.
Insidious. Artful, crafty, scheming, cunning, intriguing, tricky, designing; secret, deceptive.
Ant. Straightforward, sincere, undesigning.