What is the term for an excuse or an effort to conceal something?

The term "pretext" refers specifically to a false reason or excuse that is used to conceal the true objective or to mislead others about one's motives. In this context, it is often employed to justify actions or decisions that might otherwise raise suspicion or disapproval. For example, someone might use a pretext to avoid an obligation or to cover up a lack of honesty, presenting a façade that serves their purposes while obscuring the underlying truth.

The other terms do not fit this definition. "Prevaricate" involves speaking or acting in an evasive way, usually to avoid the truth, but it does not inherently denote hiding a motive. "Profound" refers to having deep meaning or significance, while "prodigious" describes something exceptionally great in size, force, or extent, neither of which pertains to the act of making excuses or concealing motives. Thus, "pretext" is the most fitting term for an excuse or effort to conceal something.