Not an easy task; unenjoyable or challenging. I love kids, but watching 20 of them at once is no picnic, believe me! Spending a beautiful Saturday afternoon cleaning out the garage is no picnic.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
Difficult, no fun, as in Recovering from abdominal surgery is no picnic. This expression, alluding to a picnic as a pleasant occasion, was first recorded in 1888.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
No easy task; not an enjoyable experience. This term began to be used frequently in the late nineteenth century. Rudyard Kipling used it several times, as in Wee WillieWinkie (1888): “T’ain’t no bloomin’ picnic in those parts, I can tell you.”
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer