-acious denotes tendency, generally excessive; loquacious, veracious, vivacious, tenacious, voracious.
-al, -ar; comical, regal, legal, general, regular, singular, loyal, royal, equal, secular.
-an, -ane, -ain, -en, -on; human, urban, pagan, humane, mundane, certain, mizzen (from medius). Surgeon and sexton have become nouns.
-aneous, -ain, -aign, -eign, -ange; cutaneous, mountain, champaign, foreign, strange.
-ant, -ent; volant, fluent, patent, innocent.
-ary, -arian, -arious; stationary, contrary, necessary, gregarious, agrarian.
-ate, -ete, -eet, -ite, -ute, -te; fortunate, deliberate, concrete, effete, discreet, erudite, minute, chaste.
-estrial, -estrian; terrestrial, equestrian.
-ic; civic, classic, barbaric, unique.
-id; fervid, morbid, acid, tepid.