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(I) can't rightly say

I don't know with certainty. A: "How many people are coming to dinner tonight?" B: "I can't rightly say—my family tends to just show up without responding to invitations."
See also: rightly, say

(I) can't rightly say.

Rur. I do not know with any certainty. Fred: When do you think we'll get there? Bill: Can't rightly say. Bob: Okay, how does this look to you? Bill: I can't rightly say. I've never seen anything like it before.
See also: rightly, say

I don't rightly know.

Rur. I do not know. Tom: When will Joe be getting back? Charlie: I don't rightly know. Jane: What's the difference between a first cousin and a first cousin once removed? Mary: I don't rightly know.
See also: know, rightly
References in classic literature ?
SOCRATES: And the wise soul guides them rightly, and the foolish soul wrongly.
Now, for the first time seem I to know any thing rightly.
There I have sat helpless (in spite of my abilities) ever since; seeing what Robinson Crusoe saw, as quoted above--namely, the folly of beginning a work before we count the cost, and before we judge rightly of our own strength to go through with it.
We do not act rightly because we have virtue or excellence, but we rather have those because we have acted rightly.
THE Grand Old Man of Tyneside boxing has been rightly honoured.
Dylan is rightly celebrated for his poetic and broadcasting skills.
NORTH Wales Police said Francesco Prevete was without doubt a dangerous individual who would quite rightly spend 23 years behind bars.
AT the Cathays Pact meetings we are made aware that students are not the only ones responsible for the disgusting conditions around us, and rightly so.
The vehicle is rightly sized, rightly equipped and rightly decorated with some of Canada's most prestigious automobile awards.
STUART Crawford continued his amazing winning streak when Fine Rightly and Trucking Along, both ridden by his brother Steven, gave the Northern Ireland trainer a double at Ayr yesterday.
Since then his work as Chair, helping to uncover the truth behind the Hillsborough lies, has rightly earned him the respect of all but those who should rightly be castigated for a travesty of justice they perpetrated over decades.
Although the plaudits rightly went to Andy Murray following his Sony Open triumph on Sunday and his return to second spot in the world rankings, the performance of the week in Miami arguably came from Tommy Haas.
Concerns have rightly been raised about ambulances queuing outside North-east hospitals before transferring patients.
Ahead of hosting St Pat's tonight, Doherty said: "Some of the supporters are not happy and rightly so.
ISLAMABAD, March 05, 2012 (Frontier Star): Two candidates from FATA Sunday disclosed that they were offered Rs 250 million each in Senate elections, which they rejected out rightly.