A-/An-

amoral, atypical, abiotic, atheist, anarchy

not, without

Does NOT believe in God

Be-

beside, behave, because, beware, before, behind, beneath, below, between, belittle, before, betray, behead

to cause, become

 To cause to feel little

Mid-

midsize, midterm, midtown, midnight, midway, midair, midwest, midwife, midlife, midsection, midpage

Middle

Middle of the night

Post-

postpone, posttest, postscript, postseason, postgame, postdate

 After, Later

 to put off until later

Semi-

semicircle, semiannual, semitruck, semisweet, semiconscious, semicolon, semiautomatic, semipro, semifinals

Partly, Half

half of a circle