A lot like the word it comes from, investigationem meaning "a searching into," which came from the Latin for "to track a footprint." It's exactly what you do when you investigate -- vocabulary.com.
habibi
"my love" or "my dear" in Arabic.
tongue-in-cheek
Request: remark or action is meant as a joke and should not be taken seriously, even if it sounds serious -- Merriam Webster.
dictator
a ruler who is unconstrained by law; a person who behaves in a tyrannical manner -- vocabulary.com.
purpose / goal
Request: I feel lack of purpose and I’m wondering what is the loc of purpose/goal. Maybe it is not necessary in life?
nightmare
psychological nomenclature differentiates between nightmares and bad dreams; specifically, people remain asleep during bad dreams, whereas nightmares can awaken individuals. The dream may contain situations of discomfort, psychological or physical terror, or panic. --wikipedia
curse words / profanities
Request: The ones your parents told you not to say!
cowardice
"the condition of lacking bravery, being easily frightened, or being eager to avoid danger" -- dictionary.cambridge.org
benefit of the doubt
A favorable judgement given in the absence of full evidence -- request.
"spinning your wheels"
Request: to waste one's time or energy idly or frivolously; to neither progress nor regress, but remain in a fixed, neutral position.
irony
1: The use of words to express something different from and often opposite to their literal meaning. 2: An expression or utterance marked by a deliberate contrast between apparent and intended meaning. 3: Incongruity between what might be expected and what actually occurs -- wordnik.com.
paradox
"a situation or statement that seems impossible or is difficult to understand because it contains two opposite facts or characteristics" --dictionary.cambridge.com.
sarcasm
A cutting, often ironic remark intended to express contempt or ridicule -- American Heritage Dictionary.
F.E.A.R.
Fear defined as "Forgetting Everything‘s All Right."
determinism
"a philosophical view where all events are determined completely by previously existing causes" -- wikipedia.