Someone who's insincere is a little bit fake or phony. Your classmate's insincere apology for interrupting you probably sounds like she doesn't really mean it.

When you're insincere, you're not being completely honest. A losing politician often gives an insincere-sounding concession speech, and a teacher who's having a terrible day might wear an insincere smile on her face. The adjective sincere, "coming from genuine, honest feelings," is at the root of insincere — the Latin prefix in, or "not," is combined with sincerus, "sound, pure, or whole."

Definitions of insincere
  1. adjective
    lacking sincerity
    “a charming but thoroughly insincere woman”
    “their praise was extravagant and insincere
    counterfeit, imitative
    not genuine; imitating something superior
    dishonest, dishonorable
    deceptive or fraudulent; disposed to cheat or defraud or deceive
    artful, disingenuous
    not straightforward or candid; giving a false appearance of frankness
    lacking in reality or substance or genuineness; not corresponding to acknowledged facts or criteria
    bootlicking, fawning, obsequious, sycophantic, toadyish
    attempting to win favor from influential people by flattery
    buttery, fulsome, oily, oleaginous, smarmy, soapy, unctuous
    unpleasantly and excessively suave or ingratiating in manner or speech
    concealing under a false appearance with the intent to deceive
    deliberately deceptive
    not genuine
    gilded, meretricious, specious
    based on pretense; deceptively pleasing
    professing feelings or virtues one does not have
    given to or characterized by presenting specious arguments
    not in accordance with the fact or reality or actuality
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    open and genuine; not deceitful
    echt, genuine
    not fake or counterfeit
    honest, honorable
    not disposed to cheat or defraud; not deceptive or fraudulent
    artless, ingenuous
    characterized by an inability to mask your feelings; not devious
    existent, real
    being or occurring in fact or actuality; having verified existence; not illusory
    bona fide
    undertaken in good faith
    sincerely or intensely felt
    dear, devout, earnest, heartfelt
    without dissimulation; frank
    genuine, true, unfeigned
    not pretended; sincerely felt or expressed
    heart-whole, whole-souled, wholehearted
    with unconditional and enthusiastic devotion
    consistent with fact or reality; not false
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