Insight: The task asks to form adjectives from given nouns using the suffixes '-ful' (meaning 'full of') and '-less' (meaning 'without').
Steps:
- 1. success: successful (adj. with -ful), successless (adj. with -less, rare). Sentence: She was successful in her exam. It was a successless attempt.
- 2. care: careful (adj. with -ful), careless (adj. with -less). Sentence: Be careful crossing the road. He was careless with his belongings.
- 3. thought: thoughtful (adj. with -ful), thoughtless (adj. with -less). Sentence: That was a thoughtful gift. His comment was thoughtless.
- 4. speech: speechful (adj. with -ful, rare, archaic), speechless (adj. with -less). Sentence: He was speechless after hearing the news.
- 5. beauty: beautiful (adj. with -ful), beautiless (adj. with -less, rare). Sentence: The landscape was beautiful.