frigid + -ly
frigidly (comparative more frigidly, superlative most frigidly)
You can also try words with the phrase FRIGIDLY, words starting with the letters FRIGIDLY, or words ending in the letters FRIGIDLY.
Words… ending with q, starting with q, starting with qa, starting with qo, with two letters, starting with x, starting with j, ending with j,
Some random searches:
UFOS, QNVNPJHO, KYK, MQZTHXO, ROSAT, YRQ,