Which term describes something that is harshly bitter in taste or smell?

The term that describes something harshly bitter in taste or smell is "acrid." This adjective is often used to refer to strong, sharp odors or flavors, such as those produced by smoke, chemicals, or certain plants. The quality associated with acrid sensations is literally biting or pungent, which fits the description perfectly.

In contrast, the other options provided do not denote bitterness. "Acclaim" refers to enthusiastic approval or praise, while "accolade" pertains to an expression of praise or honor. On the other hand, "abate" means to lessen or reduce in intensity or amount, which is unrelated to the concepts of taste or smell. Therefore, the selection of "acrid" as the term for something that is harshly bitter is well-founded and fitting for the context.