strict

in the strict(est) sense

Following the narrowest and most precise interpretation (of something). While not correct in the strictest sense, the word has been widely accepted among most English speakers. I wouldn't call her a socialist in the strict sense, but some of her beliefs definitely lean that way.

See also: sense

in confidence

In private; with the understanding that what was said will not be revealed. Sometimes used with the modifiers "strict" or "the strictest." I can't believe you told your husband about my operation—I told that to you in confidence! Gentlemen, please be aware that this meeting is being held in the strictest confidence.

See also: confidence

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