Letters that make undesirable
s, a, b, d, e, l, n, r, i, u are letters that make 'undesirable'
Words within undesirable
DES, AB, ab, IRA, si, IR, UN, sir, Sir, SI, able, desirable, ira, RA, DE, ND, Ra, LE, Es, Ir, Nd, Si, Ab are words within 'undesirable'