Merest

You must give close attention to the merest details.

Even the merest little thing irritated him.

The merest mention of his name made her angry.

He lacks the merest grain of common sense.

I tumbled on the truth by the merest accident, when I'd pretty nearly chucked the whole job.

Among familiars, the merest hint suffices each to know what's going on.

In Calcutta, season tickets are issued only for the calendar month, with a different colour for each month, so that this problem does not arise. The merest whisper of an idea to change Bombay to the Calcutta system brought such a howl of protest in the Press, that it was never seriously contemplated.