plac-, placi-, -plais

(Latin: to please, to satisfy; peace, peacefulness; calm, calmness)

quantum placet, q.p.
As much as pleases.

Medical directions indicating that the quantity may be as much or as little as you like.

unpleasant (adjective)
unpleasantly (adverb)
unpleasantness (s) (noun)

Cross references directly, or indirectly, involving "calm, calmness, peace, quiet": pac-, peac-; quies-, quiet-; seren-.