Correct Answer: Easeful

Solution : The correct choice is the first option.

The adjective uncomfortable means causing or feeling slight pain or physical discomfort, whereas easeful is characterised by comfort and a lack of difficulty, making things easy and relaxed. Thus, it is the opposite of "uncomfortable".

The meanings of the other options are as follows:

• Difficult : Requiring a lot of effort, skill, or mental exertion; not easy to accomplish.
• Awkward : Lacking grace or ease in movement, causing discomfort or embarrassment.
• Troublesome : Causing problems, difficulties, or inconvenience; bothersome or vexatious.