inessential

adj.

非必要的；无关紧要的；可省去的；可有可无的

n.

可有可无的事物；

1. These are just inessential luxuries.
   这些只是非必要的奢侈品。
2. It's inessential whether she will join in our activity.
   她是否参加我们的活动无关紧要。

1. Few people had spare cash for inessentials.
   很少人有闲钱买那些可有可无的东西。

The inessential indexical :
ESSENTIAL AND INESSENTIAL FEATURES OF HAWKING RADIATION
Grace: the absence of (inessential) difficulty
Essential and inessential maps and continuation theorems
On Transaction Costs, Inessential Sequence Economies and Money
Inessential Woman: Problems of Exclusion in Feminist Thought. by Elizabeth V. Spelman
A Multi-Context Monotonic Axiomatization of Inessential Non-Monotonicity
Evidence from Tfm/0 that Androgen is Inessential for Reproduction in Female Mice
MDM2 can interact with the C-terminus of AID but it is inessential for antibody diversification in DT40 B cells.
Rapsyn clusters neuronal acetylcholine receptors but is inessential for formation of an interneuronal cholinergic synapse