rules are rules
uncancellable
undeterrable
unscrewable
unthrowable
nonrepudiation
inalterable
undefiable
unskippable
noncircumventable
quenchless
unforgoable
valid
rulable
unleavenable
unmessupable
black-letter law
unforestallable
agreement in principle
fair game
unnegatable
uninfringeable
inconfinable
legitimate
by the book
unignorable
irrefusable
unrefusable
undraggable
unconfinable
unavertable
untrickable
every law has its loophole
unvanquishable
legal
standing order
undissuadable
checkless
unpunchable
untweakable
allowable
permissible
nonvoidable
ceremonious
unmanipulable
undownable
unvoidable
unturnoffable
unhijackable
unrescindable