1. (a) badly (adv.): to a great or serious degree; in a bad manner (He played the game badly).
(b) bad (adj.): guilty; ashamed. (This word has many other meanings.)
2. (a) while (n.): a (short) period of time.
(b) awhile (adv.): for a short time. (This word is never preceded by the preposition “for”.)
3. (a) purposefully (adv.): determinedly.
(b) purposely (adv.): intentionally; with an express purpose.
4. (a) ingenious (adj.): clever; inventive.
(b) ingenuous (adj.): innocent; naïve.
5. (a) alternative (n.): another choice.
(b) alternate (adj.): every other one.
6. (a) shameless (adj.): showing a lack of shame.
(b) shameful (adj.): deserving or causing shame.
7. (a) energising (adj.): giving vitality or energy.
(b) enervating (adj.): physically weakening.
8. (a) every day (adv. phrase): without missing a day.
(b) everyday (adj.): daily; commonplace.
9. (a) afflict (v.): (of an illness or problem) cause pain, suffering or distress to.
(b) inflict (v): force or impose (something unpleasant or burdensome) on someone.
10. (a) credible (adj.): believable; convincing.
(b) credulous (adj.): gullible.
11. (a) continual (adj.): very frequent; always happening; occurring at short intervals.
(b) continuous (adj.): uninterrupted; unbroken.