insincerity, n. duplicity, disingenuousness, [hypocrisy], dissimulation.
insinuation, n. innuendo, intimation; ingratiation.
insist, v. [persist], [press], [urge], [contend].
insistence, n. persistence, [pertinacity], importunity, [urgency], [contention], [instance].
insistent, a. [persistent], importunate, insisting.
insnare, v. ensnare, [entrap], [seduce], [inveigle], [allure], [entangle].
insolation, n. [sunstroke], siriasis; sun [bath].
insolence, n. [impudence], contumely, impertinence, contumacy, effrontery, [disrespect].
insolent, a. [impudent], contumelious, [overbearing], disrespectful [contemptuous].
insoluble, a. indissoluble; [unexplainable], insolvable, inexplicable.