When two people have to work late, who will meet that inflexible day-care pickup time?
They're rigid and inflexible and hopeless and just plain cuhrayzee.
Some may be concerned that a system along these lines would be inflexible.
late 14c., "incapable of being bent, physically rigid," also figuratively, "unbending in temper or purpose," from Middle French inflexible and directly from Latin inflexibilis, from inflexus, past participle of inflectere (see inflect). In early 15c. an identical word had an opposite sense, "capable of being swayed or moved," from in- "in, on." Related: Inflexibly.