In-ca-pac-i-tate, anaddasu
In-cen-di-a-ry, ffaglydd; terfysgwr
In-com-mo-di-ous, anghyfleus
In-com-pat-i-ble, anghydweddol
In-com-pe-ten-cy, anghymwysder
In-con-ceiv-a-ble, annirnadwy
In-con-sid-er-ate, anystyriol, byrbwyll
In-con-sist-en-cy, anghydweddiad
In-con-ve-ni-ence, anghyfleusdra
In-con-ve-ni-ent, anghyfleus