All 3 Uses of

trifle
in
Gulliver's Travels

Of less moment which were in my first copy, for fear of being censured as tedious and trifling, whereof travellers are often, perhaps not without justice, accused.†
Chpt 2 *

He received it with abundance of thanks, more than such a trifle could deserve.†
Chpt 2

For he argued thus: "that the two half brains being left to debate the matter between themselves within the space of one skull, would soon come to a good understanding, and produce that moderation, as well as regularity of thinking, so much to be wished for in the heads of those, who imagine they come into the world only to watch and govern its motion: and as to the difference of brains, in quantity or quality, among those who are directors in faction, the doctor assured us, from his own knowledge, that "it was a perfect trifle."†
Chpt 3

Definitions:

(1) (trifle as in: a trifling matter)
something of small importance; or a small quantity
(2) (trifle with as in: trifle with her affections)
to treat somebody or something thoughtlessly or without respect
(3) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

Less commonly, a trifle can refer to a kind of dessert. In classic literature, trifling can be a synonym for small talk.