A departure from what is normal, usual, or expected, typically one that is unwelcome.

• adjunct

• aberration

• subvert

• errant

a thing added to something else as a supplementary rather than an essential part.

• percussion

• erratic

• obsequious

• adjunct

erring or straying from the proper course or standards

• adjunct

• errant

• erroneous

• injunction

obedient or attentive to an excessive or servile degree

• obsequious

• non sequitur

• erroneous

• injunction

a conclusion or statement that does not logically follow from the previous argument or statement.

• erroneous

• obsequious

• aberration

• non sequitur

not even or regular in pattern or movement; unpredictable

• erroneous

• erratic

• adjunct

• aberration

prepared to obey others unquestioningly

• subservient

• sublime

• perennial

• subsequent

coming after something in time; following.

• sublime

• subsequent

• sequester

• subservient

continue in a course of action even in the face of difficulty or with little or no prospect of success

• sublime

• subsequent

• persevere

• permeate

of such excellence, grandeur, or beauty as to inspire great admiration or awe

• sublime

• subvert

• subdue

• perrenial