it's not rocket science(rocket science)humorous
SMART Vocabulary: related words and phrases Easy to understand
(as) clear as dayidiom
abundantly clear
accessible
accessibly
assimilable
digestible
explicitly
explicitness
expressly
fathomable
hang
in words of one syllableidiom
limpid
lucid
perspicuity
perspicuous
perspicuously
pikestaff
put/set someone straightidiom
taut