their

• Det

  1. Belonging to, from, of, or relating to, them (plural).
  2. Belonging to someone (one person, singular), or occasionally to something.

• Adv
• Contraction

motives

plural of motive

for

• Conj

  Because.

• Prep
• Particle

murder

• Noun

  1. The crime of killing a person unlawfully, especially with predetermination.
  2. The crime of killing a person unlawfully, especially with predetermination.
  3. The act of killing a person (or sometimes another being) unlawfully, especially with predetermination
  4. Something terrible to endure.
  5. A group of crows; the collective noun for crows.
  6. (slang) Something remarkable or impressive.

• Verb

vary

• Verb

  1. To change with time or a similar parameter.
  2. To institute a change in, from a current state; to modify.
  3. Not to remain constant: to change with time or a similar parameter.
  4. To display differences.
  5. To be or act different from the usual.
  6. To make of different kinds; to make different from one another; to diversity; to variegate.
  7. To embellish; to change fancifully; to present under new aspects, as of form, key, measure, etc. See variation.
  8. (obsolete) To disagree; to be at variance or in dissension.

• Noun