(idiomatic, litotes, understatement) Misbehaving, being mischievous.

Although technically a breach of some code or law may have occurred, there was no actual damage meriting punishment, apology or retribution.

Gossip and accusations are often substantiated by fact.

without a doubt; surely.

(Britain, informal) A supposed surname for a friendless person.

Not any. / Hardly any. / Not any possibility or allowance of (doing something). / Not (a); not properly, not really; not fully.

Used before different, before comparatives with more and less, and idiomatically before other comparatives. / (informal) Used idiomatically before certain other adjectives.

Used to show disagreement, negation, denial, refusal, or prohibition. / Used to show agreement with a negative question. / (colloquial) Used together with an affirmative word or phrase to show agreement.

without / like / (colloquial, usually humorous) not, does not, do not, etc.

a negating expression; an answer that shows disagreement, denial, refusal, or disapproval / a vote not in favor, or opposing a proposition