Devilishly quiet. Planning. One who is martulious is planning something bad. Example: 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.)
MARTULIOUS
Meaning of MARTULIOUS in English
Slang English vocab. Английский сленговый словарь. 2012