martulious

Devilishly quiet. Planning. One who is martulious is planning something bad.

Hershell Justice thirsted for revenge. As we watched him seat himself in that far corner of the school library, we knew we could anticipate some life-threatinging response to occur to his martulious mind - and soon. Mr. Watts, his math teacher, needed to be alerted. (See Bulywer-Lytton Awards.)