Whichever vs. Whatever

Whichever and Whatever Definitions
Whichever
Being any one or any number of a group
Read whichever books you please. It's a long trip whichever road you take. See Usage Note at whatever.
Whatever
Of any number or kind; any
Whatever requests you make will be granted.
Whichever
(interrogative) Which ever; emphatic form of 'which'.
Good heavens! Whichever button did you press to make that happen?!
Whatever
All of; the whole of
She applied whatever strength she had left to the task.
Whichever
Regardless of the ... that; no matter which.
It won't work, whichever buttons you press.
Whichever book you borrow, be sure to return it to the library on time.
Whatever
Of any kind at all
No campers whatever may use the lake before noon.
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Whichever
Any or either ... that; the ... that.
Choose whichever card you like.
Borrow whichever books interest you.
I'll buy whichever shirt is cheapest.
Whatever
Used to indicate indifference to or scorn for something, such as a remark or suggestion
We're having pizza tonight.—Whatever. I don't care.
Whichever
According to or depending upon which.
I'll buy the red shirt or the blue shirt, whichever one is cheaper.
If the work is of joint authorship, the copyright expires 50 years after the death of the author who first dies, or upon the death of the author who dies last, whichever period is longer.
Whatever
(interrogative) What ever; emphatic form of 'what'.
Good heavens! Whatever time is it?!
Whichever
(interrogative) Which ever; emphatic form of 'which'.
These chocolates all look delicious. Whichever shall I choose?
Whatever
Regardless of the ... that; for any ... that.
Whatever choice you make, there will be consequences.
I will stick with you, whatever fate befalls us.
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Whichever
Irrespective of the one(s) that; no matter which one(s).
Whichever you pick, be content with it.
Whatever
Any ... that; of no matter what type or kind that.
Whatever doubts I had were quickly dispelled.
Write down whatever thoughts come into your mind.
Whichever
Any or either one(s) that; the one(s) that.
I have a few books; please borrow whichever interest you.
They have lots of shirts, but I'll buy whichever is cheapest.
Whichever of you gets here first will get the prize.
Whatever
Any; of no matter what type or kind.
I must obtain it at whatever cost.
Whichever
(informal) Any or either one(s).
I don't mind which you have. Take whichever.
Whatever
(interrogative) What ever; emphasised form of 'what', used to ask which thing, event, circumstance, etc.
Whatever do you mean?
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Whichever
According to or depending upon which one(s).
I'll buy the red shirt or the blue shirt, whichever is cheaper.
Whatever
Regardless of anything that.
Whatever he does, he will still lose the game.
Whatever happens, stay calm.
Whichever
Whether one or another; whether one or the other; which; that one (of two or more) which; as, whichever road you take, it will lead you to town.
Whatever
(fused relative) Anything that; all that.
Do whatever works.
I’ll do whatever I can.
Whatever
(informal) Anything; thing(s) of unspecified kind, or no matter what kind; sometimes used to indicate that the speaker does not care about options.
I don't need any of this stuff, so take whatever.
Whatever
At all; in any way; whatsoever.
There is no point whatever in going on with this discussion.
Whatever
(interrogative) In what way; to what extent.
Whatever does it matter now?
Whatever
(colloquial) A holophrastic expression used to dismiss something that the speaker doesn't care about, doesn't think important, or doesn't want to consider or discuss any further.
So you don't like Mrs Jones. Whatever. What's that got to do with my question?
I wonder which I'm supposed to take ... whatever, I'll just pick any one.
Go brush your teeth. – Whatever!
Whatever
(colloquial) Unexceptional or unimportant; blah.
Whatever
(colloquial) Something whose exact kind or nature is unimportant; a thingy.
Whatever
Anything soever which; the thing or things of any kind; being this or that; of one nature or another; one thing or another; anything that may be; all that; the whole that; all particulars that; - used both substantively and adjectively.
Whatever fortune stays from his word.
Whatever Earth, all-bearing mother, yields.
Whatever be its intrinsic value.
Whatever
One or some or every or all without specification;
Give me any peaches you don't want
Not any milk is left
Any child would know that
Pick any card
Any day now
Cars can be rented at almost any airport
At twilight or any other time
Beyond any doubt
Need any help we can get
Give me whatever peaches you don't want
No milk whatsoever is left