Similar word to ter:
abstruse, complex, complicated, concentrated, confused, fierce, formidable, grave, grievous, hard, harsh, intense, intensive, intolerable, knotty, labored, laborious, onerous, oppressive, profound, recondite, rough, serious, solemn, stormy, strenuous, te
abstruse, complex, complicated, concentrated, confused, fierce, formidable, grave, grievous, hard, harsh, intense, intensive, intolerable, knotty, labored, laborious, onerous, oppressive, profound, recondite, rough, serious, solemn, stormy, strenuous, te