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in (the strictest) confidence

trusting that something said will not be told to anyone else She told me her plans in confidence, and I really can't talk to anyone about them.
See also: confidence

in the strict sense

also in the strictest sense
according to the most limited and exact meaning of a word or idea “Conservative” in the strict sense of the word is not a label that fits her. The novel is not tragic in the strictest sense, but it is certainly full of sadness.
Usage notes: usually used to say that someone or something does not have the characteristics of this limited meaning
See also: sense, strict

in confidence

Also, in strict confidence. Privately, on condition that what is said will not be revealed. For example, The doctor told her in confidence that her mother was terminally ill, or He told us in strict confidence that Gail was pregnant. This idiom was first recorded in 1632. Also see take into one's confidence.
See also: confidence
References in periodicals archive ?
Jameel Ahmed has directed that strict action be taken against sale of fire crackers.
Strict scrutiny requires the government defending a gun law to show that the law is "narrowly tailored" to a "compelling" state interest, and because most laws subjected to strict scrutiny are struck down, Amendment 5 called into question Missouri's most basic public safety laws, including its law prohibiting convicted felons from possessing firearms.
Rawalpindi -- Educational institutes have been directed to take strict security measures.
Now that North is officially a year old, Kim Kardashian has shared that the first year of taking care of Baby North has made her realise how strict of a parent she is.
Average intakes of nutrients that are often low in vegan diets, such as vitamin D, calcium, iron, and zinc, were above minimum requirements in strict vegetarians in this study.
We haven't seen the actress's daughters yet -- she likes to hide them away from the spotlight -- but we know that Hind is all for being strict in the way she raises her little girls.
Any law should set out strict guidelines and I strongly believe that individuals should have to 'opt in' when they are in a capable state to do so, having said this however, I am still uncomfortable with the concept.
CONOR McRedmond and Rebecca Blake are not the first Westerners to fall foul of Dubai's strict laws.
lambda]]) denote the set of all reverse column strict tableaux (reverse row strict tableaux) of shape [lambda].
Washington, Sep 23 (ANI): A Penn State researcher has revealed that people who leave strict religious groups are more likely to say their health is worse than members who remain in the group.
Van Gelder said in presenting the findings of the Rate Control Efficacy in Permanent Atrial Fibrillation: a Comparison Between Lenient Versus Strict Rate Control II (RACE II) trial at the annual scientific session of the American College of Cardiology.
GABBY Agbonlahor believes a strict upbringing from his father Samson helped him become a top Premier League footballer at a time when his footballing career was at a crossroads.
Activists worry that if BFI gets its way, the landfill could become a magnet for trash companies that are located outside Southern California -- and even the state -- that don't have as strict air pollution controls on their trucks.
Islamic militias are stepping up their efforts to bring strict religious law to war-ravaged Somalia.