happy - unhappy, kind - unkind, fair - unfair, clear - unclear, usual - unusual, important - unimportant, interesting - uninteresting, friendly - unfriendly, lucky - unlucky, known - unknown, certain - uncertain, confident - unconfident, safe - unsafe, successful - unsuccessful, comfortable - uncomfortable, believable - unbelievable, enjoyable - unenjoyable, reliable - unreliable, responsible - irresponsible, necessary - unnecessary, polite - impolite (or unpolite), pleasant - unpleasant, visible - invisible (but unvisible is sometimes used), usual - unusual, willing - unwilling, able - unable, clear - unclear, correct - incorrect (un-correct sometimes informal), known - unknown, informed - uninformed, prepared - unprepared, acceptable - unacceptable, conscious - unconscious, predictable - unpredictable, interested - uninterested, limited - unlimited, fair - unfair, certain - uncertain, friendly - unfriendly, happy - unhappy, helpful - unhelpful, pleasant - unpleasant, satisfied - unsatisfied, safe - unsafe, secure - insecure, organized - unorganized, dependent - undependent, known - unknown, necessary - unnecessary, believable - unbelievable, conscious - unconscious, understandable - understandable, acceptable - unacceptable, known - unknown, willing - unwilling, prepared - unprepared, fortunate - unfortunate, visible - invisible, clear - unclear, helpful - unhelpful, safe - unsafe, happy - unhappy, certain - uncertain, interested - uninterested, satisfied - unsatisfied, friendly - unfriendly, fair - unfair, known - unknown, comfortable - uncomfortable, believable - unbelievable, reliable - unreliable, responsible - irresponsible, willing - unwilling, necessary - unnecessary, acceptable - unacceptable, prepared - unprepared, conscious - unconscious, fortunate - unfortunate, organized - unorganized, helpful - unhelpful, safe - unsafe, interesting - uninteresting, confident - unconfident, ready - unready, predictable - unpredictable, informed - uninformed, satisfied - unsatisfied, pleasant - unpleasant, happy - unhappy, fair - unfair, known - unknown, reliable - unreliable, willing - unwilling, comfortable - uncomfortable, believable - unbelievable, responsible - irresponsible, successful - unsuccessful, friendly - unfriendly, lucky - unlucky, certain - uncertain,

un B2 level

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